The apartment is in a superb location, a few minutes walk to the underground and about a 25 minute fast walk to the centre along the river Danube.
Comms from Mario/support team were very efficient and accurate.
We arrived in Vienna earlier than our check-in time, so were able to use the luggage room for free while we explored.
The apartment itself was very clean and warm.
Really easy to locate also .. just look for the red door.