Barbara has a lovely spacious apartment. While I only stayed with one other person, it can easily fit a larger group. The apartment is also very near the train station and she has an elevator, so arriving and leaving was as easy as can be.
For the actual stay, the location was also ideal. It is located in an area that is within reach of other neighborhoods in Vienna, whether on foot or by public transportation. There's also a cafe right below her apartment, so it was lovely to go there and plan out my day while having breakfast.
There's also plenty of amenities Barbara provided at the apartment. I never had any questions about services or traveling because she had everything ready upon arrival.