I have to join the unofficial group of admirers of this stay, and thank all the people for their responses. The flat is situated in my favorite place in Berlin, calm and historical street from Weimar republic times (feel the sense of Bob Foss "Cabaret"!). So after busy Berlin streets it was great to return back into calmness. Connections with public transport is 500-600 meters away. Nearby are good bakery, caffees etc.
The flat is in cozy inner yard and very calm, on the first floor. Cleanness is astonishing. And I can't say it is only a room - bathroom and kitchen is just for you, only a door in the hall connects you with host apartments, in our side is one private room, but Angelika is very subtle and I didn't notice her being in this room-office during all the week.
Room is spacy, with comfortable bed and good working space, so it made my stay just perfect.
Angelika waited for my arrival after midnight and I had possibility to "check-out" at 3pm.
I strongly recommend this place, and it was really the best experience in my Airbnb practice.