I stayed for 3 nights and for that price it was quite alright.
The flat is mostly quiet although I was surprised when on a Tuesday night there was what seemed to be a Latino party in the building so there was a lot of noise that night. I didn't mind it that much, though, as I'm one of the people who fall asleep easily, but for light sleepers it could've been a problem.
What I found a bit disappointing was that the bed made a lot of noise when I sat down or moved at night. For one of the other rooms in the flat there was also a comment on a noisy bed, so I especially chose a more expensive room, yet I had the same problem.. The floorboards in the rooms are also really squeaky, so if you get a neighbor who moves around a lot, you might end up annoyed.
Otherwise, everything else was fine, the bathroom and kitchen clean, and the location ideal for walking anywhere in the city center. For such a short stay, I can honestly say it was a good choice for a reasonable price.