We had a great 3 night stay at Caroline's apartment, it is beautifully decorated and exactly as shown in the pictures. The apartment was very clean and the underfloor heating was a nice surprise too. When we saw how genuinely lovely the place was we were worried we wouldn't leave it to explore the city!
It is in a good location, we found it to be a manageable walking distance to the places we wanted to go, even the Belvedere Palace was at the end of the road! Others may prefer to take the trams or buses however. Our main contact was Caroline's friend Paul, he was very prompt in getting back to us with any queries we had, and very polite. We definitely enjoyed our stay, and if I was to visit Vienna again I would love to stay here again.