The apartament was nice (not bad situaded, well illuminated...) but, in my opinion, just fir 3 people. We were 6 and the beds weren't comfortable for all of us:
-the sofa-bed wasnt really big and two adults couldnt sleep comfortably on it.
-the folding-bed was child-size, so if you were taller than 1'65, your feet wouldnt fit inside.
In other comments, people (that were at least 5) complained about the same and we thought it was resolved.
The street was pretty calm, however, some nights, it seemed that somebody was running up and down the corridor in the apartament on top of us (the noise was so loud that a neightbour complained, thinking it was us).
In overall, the apartament wasnt bad, but if you are more than 3, i'll think about this things.