Almost perfect..the flat is located in one of the best areas you could possibly stay, very close to some of the coolest bars and restaurants. The place was clean and very stylish and spacious. The only problem we had was that there are literally no curtains covering the windows in the bedroom and living room(where the 2nd bed is located), so unless the bright light doen't bother your sleep, you'd have an very early start. If the flat had curtains, it'd be about the best place to stay in Berlin.