I had an amazing stay. I met one of the ‘friend’, she was very nice and showed me around the flat. The host gave me great restaurants recommandation and even some tips to make my stay more enjoyable.
I was very comfortable and felt the neighbourhood was calm and nice, with the market really nearby. Really close to the subway station, train station and all the tourist stuff.
The flat is exactly as described, although the building is a bit older than I expected with thin walls. I could hear the neighbours coming and going a little (it was not a big deal for me).
I would recommend to friends and go myself again.