The flat is nice, but it's simply impossible to sleep at night.
Every single night there are tens of people gathering in the square just downstairs and playing extremely loud music with giant speakers. I am not exaggerating when I say that it's like having a party in your own house, with the difference that there's nothing you can do about it. The music goes on until 6-7AM every night. We had to move our mattresses to the living room and sleep on the floor because it's further away from the noise.
When contacting the host about this, they said they were aware of the problem, but that there's nothing that can be done about it.
If that's the case, the host should be upfront about it and disclose this information in the listing, so people can make an informed choice.
Other than that, the apartment is clean, well equipped and quite spacious, and very centrally located. However, the situation at night makes it unbearable.