Yunus's apartment is one of the best AirBnB houses I've stayed at. Cozy and comfortable. Plenty of character with high ceilings, a courtyard view, and beautiful heirloom furniture. (Blessedly, you won't find Ikea in this house.) Fully stocked, so you don't have to worry about finding dishes, shampoo, or a hair dryer. I stayed with my parents who slept in the main bedroom; I slept in the sleeping nook that just fits a single bed and loved how cozy and quirky it was. If the third guest feels doesn't take a liking to the sleeping nook, the couch in the living room is plenty comfortable as well; in fact, we occasionally fell asleep there.
The location was outstanding. The apartment is very close to the Schöneberg S-Bahn station and from there, the ring trains (S41, S42...) take you to all the U trains you'll need only within minutes. Schöneberg itself is a pretty interesting and lively neighborhood and a great base to explore the city from. The hosts (brothers Yunus and Talu) are very polite and respectful of your privacy. I got several great sightseeing suggestions from Talu to get me started. I wouldn't hesitate to recommend the place and stay there again on my next visit to Berlin.