We had a great stay in Kreuzberg at Gregor's place! The room was located in an ideal spot - close to a bunch of great cafes and restaurants, close to the canal, and close to the train station for easy access to the rest of the city. The room was smaller than expected, and there were a couple issues with the bathroom (the sink was perpetually clogged and the toilet lid kept falling off) - but otherwise, it was exactly what we needed.