Olga and her husband Alexander made us feel very welcome with a very easy check-in process. The flat is some way of the center but there is easy to reach via the metro close by. The area have some good places to eat (Gasthaus Stafler and Gasthaus Quell) and is very close to Schönbrunn Schloss.
The flat itself is new, clean, warm, quiet (and warm in winter) but somewhat spartan because of the very few furnitures in the lounge.