We had a really great time at Gunnar's place. It was easy to reach from Schoenfeld Airport and a stone's throw from the park and some nice cafes. The room was spacious and quiet at night, the bed was really comfortable! We felt at home straight away.
It was easy to get around the city too, with a tram at the end of the road and buses nearby. The nearest U-Bahn was a bit of a walk, but a pleasant one (and it might have been possible to get a bus or something instead, but we enjoyed the walk!)
Gunnar was the perfect host, friendly and with lots of information about the local area.
The only thing worth mentioning is that there are quite a few steps to the flat, so if you're not great on stairs that might be an issue.
We'd recommend this place without any hesitation at all!