Four friends had a lovely weekend in Kerstins apartments! Communication was always quick and helpful, wifi worked very well, checkin- and out very smooth. The location is great, right by the Ubahn which gives you access to all Berlin delights. Supermarkt nearby on the busy Potsdamer strasse, along with restaurants and bars. True, you see some working girls outside your door in the evening, but they didn't bother us at all. All in all, I would recommend the place, and would stay there again!