Frank is a warm and welcoming host, and quick to respond to messages. He was flexible with my check out time and it was no problem to leave my stuff there on my last day before heading to the airport in the afternoon. The room was clean, the bed was very comfortable, the decor was super cool! I enjoyed my talks with Frank and he has a wealth of knowledge for what cool
stuff to see in Berlin. He gave me specific recommendations for vintage shops and arthouse cinemas. If you're staying over the weekend, he hosts a salon evening on Saturdays that's really fun and entertaining (even if you don't speak German, I really enjoyed myself). I would definitely stay here the next time I visit Berlin. 5 stars!