An FB friend is forever blathering on about Vienna and while I think it’s a nice city, her photos and my own limited experience suggest that it’s a great city to live in if you’re Caucasian - how diverse is the place really?
But for Vienna specifically, it has a sizable Turkish population as well (didn’t find a chart about ethnicity-based geographics). I also think (having visited it, but not having lived there, but a culturally similar capital) that while there are definitely some stereotype issues, it is definitely less pronounced in capitals where people actually can occasionally meet with people of color (certain ethnicities are extremely rare in this part of Europe) - but I can’t answer it any more than that.
And the OECD argues that major world cities often have more in common with each other than other cities and towns in their own countries, in both demographics and challenges, and I find Vienna to be less of a world city in the demographic respect.