We had an amazing experience at Karsten's place. The building and the apartment itself are beautiful and we had a very big bedroom + bed, which we loved. The neighbourhood is amazing, there are lots of restaurants and shops around and public transport is nearby. Karsten was a good host, he had many recommendations for us and was really nice. We didn't see him very much though. Overall, it was a really nice stay and I would definitely book here again next time I'm in Berlin!