First the positive: we were in room 8, which was spacious, with a lot of light and with a beautiful high ceiling. It wasn't the one on the photos, though, so no coffee machine. It didn't bother us, but if it's something that is important to you, just be aware. It is true, that one can hear the traffic at night and also the vibration of the metro passing underneath the street, but it didn't bother us. There are free earplugs available at the reception, if you'd need them. There are 4 bathrooms and during our seven day stay, they were always very clean. We didn't use the kitchen, so I can't comment on that.
Now the negative: I got bitten and we found several bed bugs in the room. On the bed, the second/smaller bed and basically in all four corners of the room crawling on the wall and floor. In total we found aprox. 7 adult ones. Although the hostel staff said, that they would handle it and sprayed something, we found several ones after that (maybe what was sprayed alerted them even more and made them move around). We had to take measures to make sure to not infest our home after getting back.