Berhard´s flat is just beautiful, bright and well located with all facilities being spotless. The top floor superb flat has a lovely large balcony facing a large inner courtyard with gardens. Very quiet and modern. It is just a very short walk from/to Mariahilfer street with all its shops, cafes and restaurants. It's within walking distance (or you can take the tram) to the famous Schloss Schönbrunn (arrive before 9 to avoid queues) and it's gardens and restaurant where you can experience delicious food and Viennese coffees.
You can reach Vienna's centre by Underground in a few minutes and then connect to the airport in 16 minutes. Fast trains at :06 and :36. Bernhard is really nice, polite and very helpful; answers speedily to any query you may have. I highly recommend Bernhard's flat for a stay in Vienna.