I may be suspect to talk about this subject... but, without any doubt, the most wonderful city that I've ever visited is Vienna. Not only everything is incredibly pretty (like the palaces, the historic buildings, etc): the city is very well organized, it's clean, the public services (buses, subway, etc) works perfectly, people is very well-educated. I loved everything about it, and if I could chose any city in the world to live, I would go to Vienna.