This is a great apartment on a amazing location. But not for all travelers. If you are for example a couple that want to stay in a prime location in Vienna, this is the place to book. However, if you are traveling with a baby or young child, this apartment is not ideal. Reason is the elevator. It literally is 1mx1m. A stroller doesn't fit in, so we had to carry ours up and down four flights of stairs everytime.
Also, they apartment can get very hot on hot days (36 degrees when we we're there). We had 28 degrees inside at the hottest and 25 degrees at the coolest. There is a high quality's Dyson fan in the appartement, but it is still very hot.
The appartement was spacious and everything we needed was there. Would recommend if you don't mind to walk some stairs.