We really enjoyed our stay at Ralph's apartment. Very clean and spacious, modern but with lots of character in an old building that's been renovated. It was located close to public transport, restaurants, and across the road from a park where people hang out and enjoy the sun. Ralph was responsive to our messages, and his friend Matthias met us and showed us the apartment. The Kreutzberg neighbourhood the apartment is in has a lot of character and is very multicultural. Overall a lovely recommended stay.