I didn't get to see Barbara too much since she was so busy with work but from the moment I stepped into the apartment I had a great experience. The room had a great view, the bed was large and comfortable, and Barbara had even given details on some soundcloud mixes for her guests! Barbara was nothing but nice all the time and even helped me out with a ticket for the Berlin Music Festival. If there's only one minor fault, it would be that the pub downstairs has open mic night on Tuesday night and if you're a light sleeper you might be annoyed by the sound seeping through, but it's nothing that can't be solved by a pair of earplugs. Otherwise, the flat is in a very convenient and great location with many interesting cafes and shops easily within walking distance. I would definitely come back again the next time I'm in Berlin.