I booked this apartment for myself and 9 girlfriends to stay for about five days. We had all three floors of the apartment and it was amazing! Mathilde was quick with her replies regarding all my questions in advance of the stay, which put me at ease before the trip. Even though we arrived hours before check in, we were able to store our luggage in the building before check in so that we could walk around until the prior guests had left and the apartment was cleaned.
The apartment was clean and comfortable for us to stay in and the location was great. It is an area filled with restaurants and bars, as indicated, which means that the weekend evenings can be loud. That's the price you pay for a fun neighborhood though! The one challenge was that there was a restaurant downstairs that it appears recently opened, and the smoke and smell of meat from their cooking seeped into the apartment. The smell was unpleasant (particularly if you're not a meat eater), but the smoke was much more challenging because it filled the floors of the apartment, particularly the second floor. Mathilde was super responsive when I raised it with her and send someone over to address it the next day. It wasn't fully resolved in the time we were there, but it sounded like this was a new issue that they were working through with the restaurant. The important part for me was that Mathilde was on top of it and responsive--issues will often arise, but it's the host that makes it bearable.
All in all a wonderful stay that I'd recommend to any large group!