We enjoyed our stay at Ingela's place. Early check-in was possible in an other appartment than the one booked, the flat had all we needed (maybe just a little loud on the street side). Ingela took some time to give us some hints to get along in Vienna.
If you can leave your luggage at her place on your check-out day, do it as it is quite difficult to find a free locker in Mitte or Pratter Stern.