Perfect location, good value for the money. The apartment is between a metro stop and a tram stop (~5-10 min walk), which can take you to Vienna's very centre and old town. It's also very close to the central train station, in which there is one of the few grocery stores that work at weekends in late evenings as well as loads of cafes. The only minus in my eyes was the shared staircase - it was a bit old and ran down and had no lightning when it was dark, but it didn't really impact the actual stay at the apartment which was in good condition.