We had a really good stay in Sven's appartment. It's really well located just besides you have a supermarket open until midnight in week and 11:00 pm on Saturdays.
You have a metro station at 20 meters from the building and also bus stop on the street, so you can visit Berlin easilly with public transportation.
The communication with Sven was also really easy. If I plan another travel in Berlin, I will book this appartment again.