I felt very comfortable at Nadja's house. The Airbnb consists of one big bedroom, and 1-2 meters away is the bathroom with a shower. Both the bedroom and the bathroom are modern and absolutely clean. One complete wall of the room is a large window towards the street. There is a switch on the wall that activates the roller shutter that completely covers the window.
The street does not have much traffic and is hardly noticeable. The location is very good. Very close to the Potsdam Platz and the Berliner Philharmonie. There is a subway station just minutes away.
Check-in was very easy and flexible. I didn't see her often, but I found Nadja to be a very friendly host. I highly recommend this Airbnb to any visitors coming to Berlin!