Booked this flat for 2 nights in Vienna and Gerhard & Nicole were very helpful and responsive. It was our first AirBnB experience and couldn't have been more straightforward.
The flat itself is spacious, nicely decorated (as shown) and conveniently located near the centre of town (walking distance of major tourist attractions and close to public transport). The place stays warm, has lots of natural light and the beds are very comfortable. It's in the 'trendier' part of Vienna so a great place for anyone wanting to be close to the city but not stuck in a typical/touristy hotel.
Gerhard & Nicole weren't in town on the particular weekend that we visited but arranged for their neighbour to check us in and made themselves available to us in case we had any problems.