We stayed only one night, but we had fun, Kathrin is a really nice person, and her family as well. The flat is super tidy and clean, location is like 2-3 underground stations from the center, but really quiet neighbourhood. Everything was all right, they gave us tips where to go, what to eat, they were funny, nice and we had a good conversation. Definitely 5 stars, I can only recommend. Thank you Kathrin!