We had a wonderful time in Berlin and in Carsten's appartment. The place is very spacious, nice view from the balcony, climate control in both living area and kitchen, comfortable bed, public transport within walking distance, little bakery/shop downstairs, ... Carsten himself is a very friendly host, very easy to communicate with, always ready to give some tips if needed. In fact we only had positieve experiences with Carsten and his appartment!