Location can't be beat: 90% of Vienna's greatest attractions are within a 10 to 15 minute walk... Stephensdom is two blocks away. The Belvedere Palace is a very pleasant 20-25 minute stroll away. The one and only site we needed public transit to reach was Schonbrunn Palace.
Lilly was a perfect host. She was waiting for us when we arrived and quickly delivered a fan when we asked for one by email (there was a heat wave during our stay).
Everything was perfectly clean and fully functioning with the apartment itself. The bedroom was large and comfortable. The living room and kitchen were tiny, but functional. Note there is no stove if you were planning to prepare your own meals. The bathroom was perfectly clean and in working order, but to be perfectly honest, was quite crudely and cheaply installed. At this price one could expect a little better.
We never tried the large flat screen TV but the WiFi was 100% reliable and fast.
The lobby, stairs and hallways are definitely in need of a renovation and sprucing up. The entrance way is off a side alley... a single woman might be be a little nervous at night, although Vienna seems to be an extremely safe city.
Overall we felt we received reasonable value for our money, and had a completely trouble free experience.