The apartment is very nice: bright, big, comfortable, clean and located in a quiet residential area. The metro station Johnstrasse is very close (1 min away) and takes you to the center of Vienna in 10/15 minutes, which is very easy and enjoyable. Make sure you have a bite at Das Augustin around the corner, it is delicious!
The only negative point to me was that the apartment is not soundproofed so you can really hear the neighbors next door (so think of bringing earplugs)!