I stayed for 4 weeks in the space. Someone commented on the safety of the location. I didn't have any of that impression. It is in a very residential area, within 10-15 minutes walking distance of a lot of grocery stores, pharmacies, coffee shops, and restaurants. I never felt unsafe.
There are 2 main subway lines close by and tons of buses to get you around. I found that I was within 20-30 minutes of most of the tourist/central places of Berlin. Others have commented on the noise. You do hear a lot of sirens that can get pretty loud. Berlin is a big city, and all ambulances, police cars, and fire trucks have the same siren, so it may contribute it feeling like it's noisy constantly. The building is close to major intersections of the city, so that could be it too. If you are someone very sensitive to noises, this would not be a great place for you. If you're used to living in a big city with city sounds, you should be fine. The host was pretty responsive when I reached out. There was an issue with the hot water for the shower and he had it taken care of very quickly. I loved that the apartment had keyless entry, which saves me trouble of carrying a set of keys around. There's a great grocery store on the first floor with lots of fresh fruit and produce. The apartment gets lots of good light, which is so nice.