I live in Vienna too and one thing I like in particular is that despite I live in a metropole with its 2 million inhabitants, I can jump on my bike in the summer, ride for twenty minutes to Donau, Vienna's river, and go for a swim, while being in nature. I can't think of any other city that offers what a world city has to offer, and being able to enjoy nature to the extent that I can swim in its river without worrying about pollution. Beat that.