Katrin's apartment was clean, cute, comfortable and accessible to transit. It was on a busy corner close to train tracks, however, the noise from the street or trains was not an issue for us. We liked that there were blackout shades on the windows and felt safe in the apartment. While the area outside was a bit rough, there was a residential area two minutes down the road close to the S line metro station with some cafes and shops. We were able to park our rental car on the street at night (free) but sometimes it was difficult to find a spot. We had no troubles finding the key and accessing the apartment when we arrived and Katrin always answered or emails promptly so it was easy to communicate with her. Thank you for a wonderful stay in Berlin.