I have been just three days to study in Wien, but my review couldn't be more positive. The apartment was very nice, spacious, central and comfy, and Stavroula was very kind to give me useful advice about the city when I arrived, and a free map. In the kitchen there's plenty of free fresh food, that saved me a day when I couldn't go out. If I will come back to Wien (and I hope so!), I will definitely try to book Stavroula and Klaus' apartment, if available.