A lovely place to stay in Vienna. We didn't have the chance to meet Chrissy but she answered all of our questions by e-mail and the person who was there to welcome us ans give us the keys was really kind.
The appartement itself is huge, comfortable, there is not much furniture but you have everything you need.
There is a subway station next to it but we walked to the center most of the time. The area was great. It's bit away from touristic areas and close to nice restaurants and bars.
I would recommand the place to anyone !