My husband and me stayed at Karsten's appartament on New Year holidays. Everything was perfect, there were no problems with check-in and check out. The room was very clean, there was everything we needed. Karsten met us in time at the door, showed us the appartament and told about the nearest supermarket, restaurants and interesting places we should visit. He was very kind! It was unusual for us to liveon the first floor, but the street was calm and everything was OK. The appartament was not far from the city center, sometimes we went there on foot, sometimes by metro, the station was 2-3 minutes walk. We recommend this flat to those who is going to Berlin.