Perfect location and a wonderful apartment - clean, spacious, bright, very well furnished and equipped. You'll be hard pressed to find a better place to stay in Vienna - almost everything interesting is just a 5-15 minutes walk away and can do fine without any form of public transport. The only small issue we had was the fact the bathroom is in one of the bedrooms, so sharing it was a bit problematic, but that was a really tiny inconvenience (and only an issue for 2+ people) and didn't affect our really awesome overall experience.