Communication with Dan was fluent: he was very helpful and answered last minute questions. He was very clear with directions about how to get to the flat and with instructions about how to go about his place. The neighborhood was very quiet and very close to the main attractions in Vienna.
The flat was spotlessly clean and looked exactly the same as in the photos. The kitchen is small and the plates, cutlery, glasses and the pan and the pot are enough for three people who are not willing to prepare elaborate meals and can go on very simple dishes. There are two well-supplied supermarkets two blocks away from the flat.
The WiFi connection worked really well.
All in all a very nice and pleasant place to stay. I would certainly recommend it.