We had a really good stay at Luiza's place. We stayed here for a month, for business purposes. Check-in was smooth; the host even prepared in advance some signed paperwork that we needed and was pretty responsive.
Very practical location outside the city centre, safe neighborhood, close to a main commercial centre, train station, subway, and trams. Takes about 20 mins to get to city centre by public transport. Vienna has very good public transport, so it's really easy to get around.
The apartment is lovely - warm, quiet (the noise from the nearby main street can't be heard), stylish, most things inside feel new, and looots of pillows. The flat is pretty well equipped.
Overall, had a wonderful time. Thanks!