The apartment is very modern in design - see the pictures. It has a bus stop at the front door, a tram stop 2 blocks away, and the subway about 4 blocks away. We stayed there in December - so we rode public transportation a lot. However, in warmer times, you can easily walk to most places that you would want to visit.
We were very pleased with our stay. The apartment was warm and functional, and our host had everything ready for us. We would definitely stay there again if we ever return to Vienna.