I travelled to Vienna for a week-long work trip and this apartment was ideally located.
The area is great with delicious restaurants nearby and Karmelitermarkt that is just next door.
This is essential because, if the living room/bedroom is well equipped, the kitchen is very basic. And so is the bathroom. The bathroom is not really comfortable to use because of the ventilation, that turns on together with the light switch, is very very loud. I ended up not turning the light on unless necessary.
I assume the strong ventilation is a must to reduce humidity and bad smell. When checking in, I was advised to always leave the window open to ventilate the flat. Smell was actually a problem. The smell in the flat, without being disgusting, is not really pleasant. I think this mostly comes from the linen: both the bed linen and bathroom towels smelt bad.
Other than that, the flat was rather clean.