We had a rather unpleasant stay... first off, the room was clearly smaller than 25m². The bed was really hard and uncomfortable and everything in the room was really old, including the boiler, heating and ventilation for the bathroom. Along with the uncomfortable bed every night around 3:30am there was a person right in front of the apartment door doing something (we couldn't tell what he/she was doing, sounded like clean up or so) and because the door was so thin it felt like the person was standing next to the bed, making a whole night's sleep impossible. Additionally, one morning the whole apartment was vibrating and the (non-working) radiator emitted a sound we were trapped inside a ships engine. We also had bad luck with the weather and couldn't use the balcony, maybe that would've helped.