My family and I had a great stay at Rainer's apartment. I told Rainer when our train was going to arrive in Berlin and he waited for us out on the street corner when we arrived to show us the way to the apartment. Great location - in a hip East Berlin neighborhood about 10-15 minutes walk to Alexanderplatz S-bahn station. Rainer showed us how to work the TV, dishwasher and clothes washing machine. Good Wi-fi. Our two girls stayed in one room which had two twin beds and my wife and I had our own room with a double bed. Very clean. Overall great stay.