The weird, overdone medieval decor aside (do not be fooled - this is not an historic building re-done with character - it's a bland apartment building with themed decor) there were several issues. First, there was a horrible smell coming out of the kitchen sink. We opened the cupboards below and saw that the pipes had been wrapped in plastic bags. It was actual sewer gas coming up through the pipes! So gross. The shower floor had no lip, so the water just poured all over the floor, which was constantly wet. There was no comfortable seating in the room at all. The TV was tiny and all the way across the room from the beds, so we had to pull a mattress off the bed (or else sit on hard kitchen stools) to watch a movie. Finally, it was really hot in Cologne when we were there, but the windows had no screens, so both my kids woke up covered with mosquito bites.
On the plus side, the room was a good size for a family of 4, the location was convenient, and the building was safe. Check in and communication were straightforward. But, I would not recommend this place overall.