Doris' place is amazing. The ceilings are very high, the rooms are large, and the apartment has 2 private balconies. Doris is extremely responsive to any messages or questions, and left a great guide book for us to the city as well! Be prepared for stairs, as her apartment is on the 4th floor of apartments, with 2 floors below of businesses. That's 6 floors up total with no elevator. - but with great effort comes great views :) Location is really nice - plenty to eat and drink around the building, and not a bad walk to some of the more central things you may want to see. The tram system is very easy to use in Vienna and is very convenient from the apartment, but the city is so beautiful we walked everywhere anyway.
The only small issue we ran into was with the water heater. It was not in any way Doris' fault, and in fact was a brand new water heater, but it wasn't working when we first arrived. Within minutes of sending Doris a note she called me, requested pictures of exactly what I was seeing, and was on the phone with the technician to help get it figured out. The water heater just needed to be reset with the change of temperature, but Doris ensured we were completely set and satisfied before we left the apartment for the day.
If you are looking for an affordable place to stay with a more authentic experience than staying in a hotel, this is your place!