Terrible air quality. We were choking on the dust from the construction in the neighbouring rooms and had allergic reactions the whole time. The boarding-up of the window (and the kitchen) makes no sense. We knew the room would not have windows, but didn't know there would be construction going on in the same closed space with drilling and hammering involved. The room actually used to have a window that we could have used if it hadn't been boarded up!
There is only one toilet for over 20 people, and it's in the same room with the only shower. Not to talk about the vermin living with us... biggest cockroaches I've ever seen! And I'm not even new to run-down hostels. In the end, the host tried to bribe us into giving a 5-star review, by offering to return the measly 6€ cleaning fee _in exchange_.