We had an excellent stay at Karsten's place. The apartment was exactly as shown in the pictures and very well stocked with everything we needed. The location is slightly outside of the busy part of the city but very well connected by the nearby U-bahn station. We were not able to meet Karsten as he was away during our stay but communication with him was easy beforehand. Karsten arranged for one of his friend to meet us, and she was very helpful and informative.