For our family of 4 (from the US), this was like home away from home! We cooked dinner in the kitchen on more than one occasion! We were happy about how clean the apartment was.
The building is very quiet (as is the neighborhood). Though it's not in the center of Vienna, it's across the street from the U4 train, which makes it really easy to get around.
Ingela is a very professional host. She offered lots of extra amenities, including even a couple of cell phones for local calls.
If you're tall, you might find the bathroom sink a bit small -- we also had to look up the washing machine instructions online, here: http://www.indesit.co.uk/indesit/_pdf/manuals/19506864203_UK.pdf. Otherwise, everything was pretty much perfect! We'd gladly come back!