We are very happy with our stay in Karl's flat. He was very kind with us, helping to have good restaurant address and helping us for everything we needed (he just living next door). The flat is as described, very comfortable and clean, with all needed. Perfect for us. Location is very good too. It is very near to underground line U3 that brings you in 10/15 minutes to the Stefanplatz. Also easy to come and go to the airport in less than one hour. Viena has a very good transportation network and it is very easy to move from one site to another. Also location is good as you have a nice and complete supermarket just 2 minutes walking from the flat. In conclusion we strongly recommand Karl and Lisa flat. You will have a very good and comfortable stay in Viena!