You have cryptocurrency and want to exchange to fiat in your city, is this your point of view?
If that is where you stand then you have to choose an exchange that is compatible with your city(because there are exchanges that alphas restricted some regions) and also work with exchanges that meets your specifications (it could be decentralized or centralized) then you can use the p2p services on that exchange, the transaction is overseen by the exchange but you should also confirm that you have actually been credited before releasing your cryptocurrency.

- High on the list is reputation. An exchange with a good reputation should be high at the top of your list as it poses a higher risk of resulting in you getting scammed.

- Low fees and an easy to use website is next. You need a website that does not take out your funds as fees and one that is fast and solves disputes quickly.

- You could look for one with a P2P service too.

Other features like privacy are subjective to what the user is looking for.

First we needed to understand the kind of services you want, if it is decentralized exchange services you need for your city in terms of cryptocurrency exchange, if so then there are lots of exchange that can help you get a P2P transaction on your local currency, we have kucoin, Bybit, Binance etc, you just to look for the one that has the availability of your local currency to do a P2P transaction with then read the terms and agreement before going ahead to use it.
 If it is cash you want, then an exchange will help you to pair with somebody that will pay the the equivalent of the cryptocurrency you have in your local currency into your bank account.
What to look out for, make sure your bank account is been credited before releasing your coins.