My boyfriend and I stayed at Kerstin's place for few days and it was a great experience! The location of the place is great! Minutes away from the tram and busses and even walking distance to Alexanderplatz. The area itself is charming as well, with places to eat right there. The apartment itself was nice as well. Clean, cozy. The only small inconvenience was the bed - you have to climb on the stairs. But it is clearly shown in the pictures, so no surprises. Communication with Kerstin was easy as well, before and during the stay. We had a great time in Berlin and loved this apartment!