Christoph and Gerda were both great, going out of their way to allow my guests to get in before we got there, as we were delayed. Christoph went out of his way and dropped in later that night to make sure everything was okay, and to provide excellent tips on unique culinary experiences.
The apartment was well located (being close to transport as well as Naschmarkt), clean and the air-conditioning was welcomed in the 30+C days. The rear balcony we a fantastic location for an evening snacks over drinks.
There was also a guide on dining and shopping provided in both German and English, which was very helpful.