Katharina's apartment is lovely. Perfectly situated, stylish and very well kept. My first time in Vienna was made all the more pleasurable because it was like being at home. I found the apartment very easily and Florian (Katharina's brother) met me at the door and explained all I needed to know. Tube, tram, buses and railway station are all within a 3 min walk. Museum Quarter, Wiener Stadhalle, Mariahilfer Strasse (major shopping street) and Schonbrunn Palace are all with in easy reach. Just a few stops on the tube gets you to St Stephen's Cathedral and Wiener Rathaus. It really is the perfect place to stay.