I didn't get to meet Karsten in person but his place was wonderful! And it was set up and prepared perfectly for our arrival. Lots of natural light. Great for a party of 2. Very close (2 minute walk) to the nearest U-bahn station. In a very safe neighborhood with great restaurant options nearby. Karsten was on the whole very communicative, responsive, and we had no issues during our stay. I would recommend his place.