We stayed 5 nights in Alexander's apartment and we really loved it. The place is very comfortable, very clean and part of a beautiful old building in a perfect location. Alexander was always very fast in responding to our messages and questions.
The apartment is located in a quiet part of the neighborhood, but you're only have to walk one block and you're in the middle of a couple of great and lively streets filled with nice restaurants, (coffee) bars and bakeries. Special recommendation: Tzom across the street. Very small restaurant with great food and a great owner. 2 U-Bahn stations are within a 10 minute walk but we preferred to explore the city by bike. Conclusion: great experience and great value for your money!