We enjoyed our stay at Doris’ place while exploring Berlin. The apartment faces south (opposite from Frankfurter Allee) and is very quiet. It's on the 6th floor (considering 0 the ground floor), so you get a view of the Berlin skyline. It also feels very spacious thanks to the high ceiling (~3m). The single bed in the bedroom was comfortable, the sofa-bed in the living room was ok-ish. You'll find anything you need in the kitchen, no microwave though. There is a washing machine, but drying was a bit tricky. WiFi was good (~10Mb/s).
The neighborhood has many restaurants, bars, and little shops right around the corner. There are some grocery shops within 10-15 minutes walking distance. If you go further SW, towards the East Side Galery (part of the Berlin Wall), you'll stumble upon some not-so-great places with weird people.
We did not have the opportunity to meet Doris in person, but she was responsive via Airbnb. She was flexible with the check-in/check-out times, which helped us with our itinerary and planning. The check-in/check-out was arranged via a neighbor (Hanna), who fluently speaks English and showed us around.
We would stay at Doris' place again while in Berlin.