We had a very good time in Steven's apartment. The location is good - only few minutes walk from quite central metro station that would get you anywhere and only two stops away from the very city center, there are two cafes just outside, a supermarket nearby, the Prater is a few minutes walk and even a fancy restaurant. But this said, the neighborhood is not the most pleasant to walk through at night or early morning. Nothing ever happened to us, but the population on the street outside the apartment makes you look back and check again for your wallet.
The apartment itself is clean and spacious. We were just a couple, but it could easily fit four people. The main problems though were the not quite comfortable double bed with two mattresses put side by side and pulling apart as you sleep; and the not very equipped kitchen - if we would want to cook there a real meal, that would be difficult and probably frustrating.
But with all this Vienna schnitzel and apfelstrudel we didn't do much cooking. In all and all we had a great time, and the value for the apartment is good even considering the drawbacks I've mentioned. Thank you!