We really enjoyed our stay at Liliana and Michael's apartment. They were really nice, helpful and even let us stay after the checkout times since our flight was quite late.
The place is 6-7 min away from U3 metro station and 8-10 min from WIen Mitte, where you can catch the train to airport, another metro stations or some other public transport. There are also other means of transportation nearby like tram num.:1, but we never tried them.