I returned to Vienna and enjoyed my stay in Regina's apartment so much the first time that I stayed here again! Regina is very communicative, quick to respond, and helpful with local tips. The apartment is incredibly stylish, clean and beautiful. The master bedroom is huge and the second room is very comfortable. The apartment is located close (<5 min) to several good restaurants and a close (~5 min) walk to the U4 line which makes it very easy to get into the main part of the city.
I would very highly recommend a stay in Regina's apartment!