Our stay at Nena Apartments was fine. It was clean and the place was pretty comfortable. Nice furnishings and a cool rain shower. Check-in was little weird. The person at the desk didn't come to the front door but instead brought us through a side door so we didn't disturb other residents. Other guests weren't kidding about noise travelling at night -- we heard people walking (not stomping) around upstairs, and the sound of the washing machine in the hallway was like an airplane taking off. The area itself is quiet and a little distance away from things, but within walking distance of Kreuzberg which was awesome for restaurants and bars. For an Air BnB, it was adequate.