My brother and I stayed at Anton's place for two nights and we wouldn't have found any better accommodation. It is really close to the city center, just a few streets to the Tiergarden, underground is few metres from the flat and there are some shops and bistros. The flat itself is quite big with high ceilings and the room we booked was really nice, large with everything we needed and even more.
I was kindly surprised that Anton took us even on short notice. He was welcoming, showed us around the flat and was willing to help, so I would definitely recommend him as a host.