We highly recommend Cathrin and Christian's place. We were lucky enough to stay there for five months and have only good things to say. Cathrin and Christian were excellent hosts and lovely people. They put in a huge effort to make sure our stay was as enjoyable as possible. The apartment was a great size for our family of four and was very well equipped. It is in an excellent location, close to supermarkets and within easy train/tram trips to all of Vienna's attractions.