I would recommend this accommodation highly for a holiday in Berlin. The apartment we stayed in (number 101) is one of a number in the Apartment-Hotel and is really good - adequate space and very clean and bright. The location is excellent. It is right beside the U-Bahn station from which it is easy to travel to any part of the city. It is also very convenient for getting from and to the airport. The area is very vibrant and full of life. There is a wide range of cafes, ice cream parlors, bars, restaurants and shops within 10 minutes walk; and cinemas and a theatre.
I would definitely consider staying again on future visits to Berlin (which I intend to take) and will be recommending it to friends.