The apt in Vienna was a great place to stay at. It's in a lovely location--either a long walk or a fast train ride to major attractions; since we like being on foot, we only went by train when rushing around our last morning. It's near a sweet neighborhood with small boutiques and cafes just a couple of blocks away--market's there too if you plan to cook or eat in.
The place was clean, bright and as described on the site. Comfortable beds, and stocked to meet most of your needs. Only negative is that it's rather sparsely decorated and furnished--could use a coffee table and something on the walls. But maybe that's better than cheap art for the sake of filling space! I wouldn't hesitate to rent this place and I'm surely glad we did.