I would definitely recommend Gebhard’s place! He is a great host. Responses were very quick too. Although we arrived after midnight he waited for us and gave us very warm meeting and showed us his apartment. Gebhard gave us very useful tips about the neighbourhood (the shortcut was very useful). The apartment was very nice, clean and comfortable... and it is better than it looks in the pictures. There is everything needed for a short stay. The location is very very good - 5 min walk to Mariahilferstrasse and very close to U3 and U4. U2 is close too. The rooftop terrace offers wonderful views to Vienna.