Christian is a very flexible host, quick to respond to queries and requests. The flat is well located, only a few minutes walk to Ubahn Kagraner Platz, only three stops from the Vienna International Conference centre, with good capacity prior to the morning sessions (unlike the other direction from the city centre), and is located in a very quiet building, with lift in the building for easy access (no steps to get into the flat from the street). The flat is spacious and has a lovely balcony for breakfasts in the sun. Good bed (I slept well), good shower (over bath) in very spacious bathroom, mostly well supplied kitchen (plenty of pans, glasses, cutlery, plates, cups etc, also spices etc, even a drinks table, NB water boiling for tea in a pan as no kettle). Very good wifi, and tv with some channels which you can switch language from German to English, good number of sockets for charging mobile devices etc.
The only thing that could be improved is the smell of smoke in the living room (bedroom is fine), which could perhaps be resolved with more regular ventilation and/or airfreshener products?
Can recommend, as also good value for money