We just stayed for 2 days but it was a great experience.Stefan so kind and gentle during to whole our holiday.He explained everything even how can we go there which public transportation is useful etc.I'm totally sure if i go Vienna again, i will choose Stefan's house.Also flat was so clean and there was everything whatever we needed.İt was really close the city center and if you chose Stefan there is no possibility to lost your way in Vienna:) We loved it:)