Our stay at the Airbnb as six friends travelling together was really pleasant. The apartment is in an amazing location, very pretty and was also very clean. The only point for improvement would be to clarify more clearly that the third bedroom is in fact the living room (it has glass doors to the hallway and is connected to the kitchen). This wasn’t any issue to us or affected our experience but it might for some others.
We have never seen Diana personally but our experience with check in was also very good and easy. There was even tea and coffee provided which was simply very great and free WiFi too. Would definitely come back if we go to Vienna again :)