Anna-Theresa was travelling when we arrived, so wasn't available to meet us. She arranged for a friend to come and let us in. The heaters were unfortunately broken during our stay, but her friend made sure that we had a space heater that did the trick for our short stay.
The space was as advertised - a good size for a short stay. It was conveniently located close to two subway stations (and several bus/team stops, although we didn't use any above ground transportation during our stay). WiFi is solid. I would recommend staying here if you have a cell phone that will work while you're on vacation as it was a little difficult to coordinate everything using email when we only had reliable WiFi when we were in the apartment.
We definitely recommend taking the Ring Tram on day 1 as it was an excellent way to familiarize ourselves with Vienna. Also, standing room seats at the Vienna State Opera are €3 or €4, worth going to see!