Jennifer has a beautiful apartment with stylish furnishing and conveniently located (in our experience it's a 20 minute walk until the state opera, but there is also a metro station only 2 min away) and we enjoyed our stay very much. Communication was easy and pleasant. We didn't meet Jennifer personally, we were welcomed by her friend who was very helpful and immidiatly had some good advice for our stay in Vienna.
All in all, I highly recommend this apartment