This is a wonderful apartment from which to explore Vienna. It's small but has everything you need for two people and very comfortable. In addition, you are in an old building, high ceilings, big windows which feels so much nicer than an impersonal hotel.
We were on bikes so I can't comment on getting around by foot but there was public transport near by. We did walk to the park close to the apartment in a few minutes for a picnic supper though!
Corinna was super responsive, thoughtful and extremely helpful.
We would really recommend this place.