The location of this place is approximately 10-15 minutes by walk from S-Bahn, but there is a bus stop about 3 minutes away, so it wasn't such a problem.
The room is very small - not a problem for me. It was clean and minimalist. Windows lack curtains so sunrise might wake you up. The kitchen is rather small and kind of disorganized, but it is clean and working. The bathroom is very well maintained.
I didn't get much to talk with Dimitri but he seems like a considerate person. Thank you!