We had a great stay at Armin's apartment. It was very clean, and supplied with everything we needed. We loved having two balconies! Armin was also very communicative and answered all our questions. I would say the only downside is location, since it is a bit far from some of the cooler places in Berlin. The crowd here is definitely older, mostly saw 50+ year olds at the restaurants, so being a younger couple we felt a bit out of place. But the apartment itself is very lovely!!