I came to Berlin for a job interview and stayed here two nights, with two friends. The appartment is spacious and was brand clean. The main benefit is the location, close to Friedrichstrasse station, in a lively area with lots of restaurants, pubs and coffee houses to choose from. Communication with the owners about pick up of keys etc. was very easy. I wouldn't recommend this for a holiday or for when you plan to stay inside a lot (but who would do that in Berlin?) since the appartment is quite dark, but for a short trip it is a perfect place to come home to.