Our host Alex provided a last minute alternative apartment for our 2 night stay after an issue with the hot water boiler at the original apartment. It was great that he was able to do so.
We got a little confused about the best route into the centre of Vienna using public transport but worked it out. We sense that the Metro was the best means to get into the centre to see the sights, leaving the car in a free on street parking place outside the apartment that we may have been lucky to find.