This is a good basic three bed studio flat – ie one bedroom is the kitchen/dinner – that is ideal for a long weekend in Vienna. The area is quite hip – cycle cafes, vegan restaurants, and the fancy market with good bakery and fish restaurants (if you want to eat sea food in one of the most landlocked capitals in Europe. But the quality and freshness was good).
The studio flat is near Karlsplatz, so 10-15 to Hofburg.
Thomas's advice on U-bahn and trains from airport, was very precise and useful.
The apartment is not a place to linger, but is an excellent base to see the city.