What's good:

* The apartment is very conveniently located, close to restaurants, shops, and tourist sights.
* The apartment is comfortable and well equipped.
* The people who run it are very friendly and helpful.

What's not so good:

* There's quite a lot of noise from the street, even late at night. The local teenagers like to congregate on the steps below, and have loud conversations until 5am.
* The internet access is hotel-style, with a 'captive portal' web page that you have to log into. Every time you leave the apartment and return, you have to log in again on your phone. This quickly gets tedious.