We had a great stay at Ben´s place. Very nice area, U-Bahn/subway very close and convenient, shops/supermarkets/bakeries very close. Nice building and apartment quiet, tons of light, 1 bedroom, living room, kitchen and bathroom. Everything you need for your stay in Berlin and he was very welcoming as he left us some cookies&tea! Everything was very easy (communication with Ben, how to get the keys etc.) and it´s very easy to get there from the airport.