Citadines Danube is located in Donau, about 15 minutes by U-Bahn from the city center, but the U-bahn stop is directly across the street (along with a huge shopping mall). There are a few restaurants nearby and the hotel offers breakfast, but the apartments contain kitchenettes and there is a Spar (small supermarket) on the ground floor so you can easily fix your own food. You can also get an evening drink at the bar on the top floor. The room was spacious and comfortable. The front desk is open 24 hours a day, which was useful when I needed a cab to go to the airport at 4:30 AM. Staff were friendly and helpful. I would definitely stay here again. One note: the hotel entrance is on the second floor of a large modern building. It took me a minute to find the entrance (up an escalator) when I first arrived.