The apartment itself is great! Clean, roomy, everything a family needs for a vacation & more. Having a subway station around the corner is a big plus - every interesting place in Vienna is just a short ride away. Two things though: its actually 1.5 baths and not 2 baths and some of the people you run into in the hallways (especially when you come home late at night) are not for the faint hearted.
Besides that: we would not mind staying there again