We were very pleased that we chose to stay at Ingela's flat on Neustiftgasse. It was clean and quiet and comfortable, and well and thoughtfully equipped. However, the really great thing about the flat is it's location . Which is just a few minutes from many of the museums, the Ring, and a 15 minute walk through the all the Imperial grandeur to the Stefansplatz, I.e. right where you need to be.
We didn't get to meet Ingela as she was called away by family matters, but even from a distance, she kept in good contact with us, and when we had some difficulties with the electrics, she got it sorted very efficiently. If there's any down side it's that the flat is a little dark, but it's in a lovely old house, and wasn't a problem. Recommended.