Nice, very clean place in a convenient location close to Ubahn and trans and within walking distance of the university campus Altes AKH. It's a traditional Viennese apartment with high ceilings and wooden floors and the owner has decorated it nicely. There's a lift. The kitchen has all the basic amenities one needs. The bathroom features a somewhat high bath tub/shower, which is a little awkward to get into. This may not be suitable if you have any mobility problems.
It's a relatively loud neighborhood with traffic (trams, light rail trains, cars), but if you keep the windows closed, you will not hear anything. The house is quiet. Right across the road, there's several really good restaurants.
We had a very comfortable stay and would definitely return!