I stayed in Simon's apartment several weeks and it is simply perfect to live in Vienna like a native. Centric, clean, functional, with all the space and amenities you may need. A quiet neighborhood, near the commercial street Mariahilfer and with many cafés, restaurants and supermarkets at hand. There are also a couple of bike stations around, a direct U line to Vienna Mitte and Schönbrunn, and it is not far from Westbahnhof or Belvedere. I definitely recommend the place. Simon and her sister are very kind and efficient people. I had some wonderful days in Vienna and probably the apartment had something to do with it.