The building is not well managed, things don't work as it should.
Search online for pictures of the toilets before booking, and check the comments on Google Maps. The pictures on Interhome are not recent.
The toilet smells of old pee, and the smoke from the neighbour goes to your apartment via the ventilation system. From the bed, you can hear everything from the other apartment... people talking, TV, music...
The only good thing is the location.