I had a very good stay at Karl-Heinz's place. The apartment is perfect for one person or a young couple, modern, the appliances work well, and there is great light from the expansive windows. (Unfortunately, it was too cold outside for me to take full advantage of the large deck/balcony.) The location is great too, very close to the city center and literally 2 minutes away from the subway. I had no troubles connecting with Karl-Heinz on the phone. Overall, it was a great experience.