The flat has a great deal of charm with a touch of faded splendour which adds to its comfort. It is also very conveniently located for the Belvedere, and the Rennweg S-Bahn to and from Vienna airport and is only 20 minutes brisk walk from the city centre.
There is useful tourist information provided in the flat and the well-known restaurant guidebook, Gault and Millau, has its offices on the same floor. The staff are very friendly and quiet.
It is very important that you ask the hosts, at the time of booking and before the free cancellation date, about the state and progress of the demolition/construction works in the immediate vicinity during the period of your stay.
We drew the short straw and had to suffer very loud banging, crashing and pneumatic drilling each weekday morning between 6:30am and 10am. We don't know how much longer it went on as we went out around 10am. It felt as if we were in the same room as the workmen and the whole building vibrated.
There were also some issues with cleanliness, which I have alerted the hosts to: stained undersheets and upholstery needing a good wash.
As long as the noise issue and cleanliness are addressed, this is a unique and attractive place to stay.