The apartment is not big, but it is very nice and comfortable. The kitchen is fully equipped, you will find everything you may need there. The location is convenient: it is in 5-minute walk from the Westbahnhof Railway Station where there are metro stations, tram stops, supermarket and different shops. The apartment has good connection with the historic center, Belvedere and Schönbrunn. It takes about 40 minutes walking to get to Hofburg or about 15 minutes by metro (4 stops). Belvedere can be reached by one tram, and Schönbrunn is in 4 metro stops away.
If you want to go to Salzburg, there are trains departing from the Westbahnhof.
The owner - Lisa - is a very hospitable person, she meets you in person and explain you everything about the apartment, the location of city attractions and the way you can get there.
I would definitely recommend this apartment.