I'm a huge non-fan of all these buildings glommed together, 5 or 6 stories high, and I find it oppressive, personally.
By my reckoning, Vienna is an Imperial Fortress with working-class box-traps being used as buttresses around the center. I wouldn't call it beautiful by any stretch of the word - oppressively architected inventory of the masses does not a beautiful city make.
But hey, to each their own. If you find it beautiful, more power to you. I can't stand Vienna, personally, and am glad I live outside the city border near Bisamberg ..