For you it may sound like a bad idea because of so many reasons which you think it is not good for you to spend such a large amount of Bitcoin to house rent but this person he knows the reason why he decided to spent bitcoin for rent best to him. I don't think spending bitcoin on house rent is wrong,  bitcoin is money that can be spent, it is not just for hodling .

I know this is the period of hodling Bitcoin against the coming bull market but if one still have much of it to spend it, then it is not a bad idea to spend bitcoin.  In some countries bitcoin have been accepted as cash which people can spend it just the way fiat is spent.  Bitcoin is money and everyone will decide what to spend his/her money on. Since bitcoin is money, you know money is meant to be spent, this is one of the purpose of having money.

The use of BTC for payments and transactions is not a new thing. Businesses in most countries accept BTC payments and individuals may request their bosses to pay them their salary in BTC.
I am not just exaggerating, I have read countless of stories here on how individuals got to accept BTC payments for their business and am very sure real estate business ranks among businesses that can and should allow BTC payments since it may incur less fees than what the bank would offer.

It depends on if the house owner also decides to accept the rent payment in BTC and also if it is a legal tender or it is not banned in total by the government in that country or region. So it would be necessary to ask first before concluding on the payment option of cryptocurrency.

More than just waiting to trade and make profits from BTC investments mostly as new events are unfolding like the ETF just being approved and the halving to happen, is the choice to either HoDL, spend, diversify, convert to other trading pairs or simply just accumulate. Everyone has a choice of right to do as they deem fit with their crypto holdings.

I mean if you're going to look at Bitcoin we know that Bitcoin is just digital money so it would probably make sense to use it as a payment method probably for sure, it's probably going to be a good thing since Bitcoin is being used as what it is. On the other hand, it's for sure a good move for the landlord to accept Bitcoin as a payment, for sure is probably an investor already because he's interested in accepting Bitcoin as a payment, and for the payer, it might not be a good idea in the long run since we are all accumulating Bitcoin but probably if your investing all of your money in Bitcoin might as well you can just use Bitcoin in all of your payments etc.

You can really say that it is a bad move for someone who is going to use Bitcoin as payment, I mean you dont really know what is her situation so we can't really assume anything, For sure if the owner is going to accept Bitcoin as a payment we can easily assume that he is as well going to hold it and not just gonna sell it, because accepting Bitcoin as a payment method means your investing it as well, if he's just going to sell it would be a big lose for sure because the market is just so volatile.

Paying house rent with Bitcoin or with fiat or with other things is actually not a problem. It's different again about saving bitcoin vs saving fiat. But paying with bitcoin vs paying with fiat I don't think this is anything to debate too seriously. Because paying is short term. Meanwhile, being a Hodler or saver is long term.

But if we buy bitcoin at a high price and we require a high fee in payment transactions which makes rental payments actually more expensive than using fiat then this is something we have to think about. But sometimes many people want to try the sensation of paying in the real world with Bitcoin, regardless of fees or whatever. Because the goal is the sensation and experience itself. And this experience can sometimes be quite a pleasant moment. Or if someone has no fiat and only has bitcoins in their wallet. So it will indeed be more economical if he pays directly with bitcoin rather than having to first transfer to an exchange and then exchange it for fiat and withdraw the fiat via p2p or with normal withdrawals which of course require other fees. Well, in those conditions it would be better to pay directly with bitcoin (if I were in that position). So the bottom line is that everything can be judged as good or bad depending on the situation and position you are facing.

How then do you think that Bitcoin will get massive adoption if it can't be used to sort out bills just like fiat? There's nothing bad in using Bitcoin to pay any kind of bill hence the transaction is done with someone who accepts Bitcoin and the amount to be sent in Bitcoin is also well negotiated. For someone who's a Bitcoin holder, using some Bitcoin to pay bills doesn't affect you since the price of Bitcoin is not using stable and buying Bitcoin can be done anywhere, anytime without any form of trouble, personally I will be glad to pay my house rent with Bitcoin but I will also consider the transaction fees before doing accepting to pay with Bitcoin.

Bitcoin is only a digital currency that is currently used optionally, as legal payment for countries that adopt it and has become a commodity currency in several countries that do not provide full regulation. Overcoming the problem of world inflation certainly cannot be done with Bitcoin alone, it is a big and complex problem so Bitcoin is not the only solution. There are indeed various factors that influence it.

You seem to be forgetting the main purpose of btc to serve as an alternative digital currency against fiat. I don't see anything inappropriate in it except may value more in future than at the price it was traded.
The point is, to some, using btc to make payment is more satisfying than just keeping it as asset to be valued in later years.
It is individual choices, some core bitcoiners wants to be able to spend their btc on anything and boycotting fiat completely.

This is actually just a transfer of value, and any payment can actually be made with Bitcoin as long as Bitcoin's BTC liquidity is still good and there are no regulations that prohibit sending Bitcoin from one wallet to another in the relevant country.

Buyers or sellers can easily estimate the value of transactions that occur by looking at market prices, which means that for both sellers and buyers, Bitcoin transactions are only a cover, while their aims and objectives can vary, one of which is only to transfer money value.

The seller receives Bitcoin, then immediately sells it on the market for FIAT if the seller wants cash. Finished.

There was no financial mistake here, and it would be ideal if the two parties had already reached an agreement before paying the house rent in bitcoin. Bitcoin's primary purpose was to aid in financial transactions rather than for investment purposes, but its volatility has prompted people to look into it further. To me, paying in fiat or bitcoin is the same thing because the value of the house in fiat will not remain constant for years, and the value of bitcoin can change, which may or may not benefit the landlord who will hold the bitcoin with which he was paid the house rent.

We all have different opinion, spending crypto doesn't mean that you are lacking on financial knowledge.
Some people see it as a currency while most of us see it as an investment tool, it all depends on how you see it.
To be honest I used to spend crypto like fiat before buying mobile load or paying for something.
I know that crypto or Bitcoin has a potential to grow but that doesn't mean that we couldn't use it as a currency.