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I think 2 days is enough for Vienna. Depends a bit if you really want to go and dive deep into detail in the Sissi (Empress) / Franz Joseph history... There is a very nice Hungarian restaurant in Vienna by the way. I can't come on the name, but they make their own iced tea. I went there 2 or 3 times and the food was excellent. I treid to look for it in Tripadvisor but I can't find it there neither. Maybe it doesn't exist any more. That would be a pity. !CTP