I would highly recommend Gudren's place. It is ideally located in the city, close to everything yet just far enough away to be very quiet and peaceful. The flat was very clean and spacious and had everything you need for a comfortable and enjoyable trip to Vienna. Communication was excellent with good directions and recommended travel to and from the airport. The airport bus stop is just down the road which makes getting to and from the airport cheap and easy. Gudrun also made some great recommendations for restaurants and things to do which was very helpful.