If you need to stay in West Berlin this hotel has a great location (50 m from Ku'Dam and literally "above" Ubanh): 10 minutes by foot from Berlin Zoo, Bikini Berlin, shopping area on Kudam. Beds are excellent, rooms and bathrooms large enough. Breakfast is one of the best I ever had (above 4 stars)!
The staff is really efficient; casual and funny, which I appreciated very much. I highly recommend this hotel.
Ask for rooms taht are not on the street: there is a club on the other side of the street which may cause inconveniences.