The apartment and host family are great for us as well as others say.
It is easy to access to the Vienna central station by barrier-free bus like a tram. The road to the apartment from bus stop is smooth and easy to carry the baggage with wheels. The station has coin locker (€3.5), clean WC (€0.5) and tourist information counter, in addition it is easy to access to the airport, Salzburg and so on.