I've just returned from a 4-day visit to Wien and I can't describe how impressive the city is.
I've seen a lot of big and/or historical European cities but most of them don't even come close to Wien imo.
The city is more than beautiful, the people are extremely friendly, the city was remarkably clean,...
At almost every streetcorner we turned, there was yet another beautiful site, a beautiful palais, a beautiful square, etc. It just never stopped
@britt: The Schönbrunn itself might be prettier than the Hofburg (and the garden, for some reason, I liked more than the one at Versailles, perhaps because it seemed more natural and was a little more sober), but personally I was more impressed by the latter for some reason. The entire part of the city of the Hofburg, the Neues Rathaus and the 2 big museums is just amazing. There are also some great museums harboured in the Hofburg/Neue Burg (Weapons & arms, Imperial treasury, silverware museum, Sisi-museum, etc.).
I think the only city-trip that could top this one would be St-Petersburg (still hoping to get there some time soon
).
I'll surely be going back to Wien soon since we didn't have time to see half the things we wanted to