Karsten's place is outstanding and very stylish. The location was very good and with close links to transport, shops and restaurants. There is underground station very close to the place but if you don't mind walking you can easily get to city centre on foot. Karsten was very helpful and welcoming. Our plane was delayed by an hour which meant we arrived in Berlin quite late but the host was very understanding and came to meet us at arrival giving us tips on local amenities and local transport. I would highly recommend Karsten and his appartment, without a doubt, to anyone who wants to visit Berlin.