Vienna was beautiful to say the least. Picture the ideal Christmas town on a postcard and you have Vienna. It was constantly snowing, but not too cold and there were street performers down every alley, generally mimes or masked dancers.
There were many white marble statues in almost every street corner on the buildings. Also, in every square there were tons of Christmas trees being trimmed and pruned. Sometimes, it was a bit difficult to navigate because it was like walking through a forest of pines.
If you go to Vienna, go at night because it was the most beautiful sight. It could never be truly nighttime because the lights lit the entire city. My only complaint would be that there were so many tourists everywhere that it was impossible to find a place to sit inside that wasnt packed with people.