I stayed an entire week at Gerhard place. They are easy-going people, I really felt like being at home. I was quite sorry at the end cause I had no chances to share a lot with them, because of my busy schedule. Of course, as you are living with others, you don't have the privacy of a hotel but you do have all the comfort of a house. Favoritenstrasse is a nice pedestrian area with all the shops/bar you may need. The train station is also within walking distance and so Belvedere Park and the War Museum. Gerhard left a very useful map of the cities with smart tips for tourists. Godd experience!