My friend and I stayed 5 nights at Gabriele's, as we were in Vienna for a short holiday.
The appartment is really closed to the metro (U4, direct to Karlplatz, Schöbrunn, 15 min to the city center) and a tram stop, as well as many convenience stores and supermarkets.
We felt very cozy at Gabriele's and really apreciated the help of her daughter who lives next door.
We strongly recommend her place for your holidays!