We stayed, for a week, in a studio apartment. Very well-managed. Very clean. Terrific staff. Excellent location. Reasonable price - - 693 euros/7 nights. Some larger units have a full kitchen; our studio had a fridge, cooktop, and combo microwave/grill/oven. There were also a toaster and coffee maker, and plenty of kitchen accessories. TV, free wifi. They did our laundry for 8 euros/bag. They offer a shuttle to or from the airport for 30 euros for the two of us. (We paid 40 for a taxi when we arrived.) It's where we'll stay on our next visit to Vienna.