My wife and I moved to Vienna and needed a temporary place to stay for the few weeks before finding our own apartment and chose Margarete's place because we had read about Vienna's District 7 (Neubaugasse) and wanted to learn more about the area.
Overall it was a wonderful experience. Margarete was very communicative and friendly. Her apartment is charming and supremely well located. The U3 is a short 3 minute walk away and in every direction you have nice boutiques, cafes and restaurants. It's a great area to get a 'local feel' while in Vienna but with lots of amenities nearby.
The only 'issue' was that because my wife and I were moving we had a lot of luggage and it dominated the apartment (which is on the smaller side). If you are only bringing a few bags for a week or two this is the place for you!