The best cappuccino I've ever had in my whole life. Ever.*
Pay as you wish.
Keep it simple: an espresso, a cappuccino, a caffe latte.. They recently started serving Eiskaffee (English speakers: this is a coffee-float, ice cream+coffee), and tea. They also have a muesli and yogurt bar, and paninis made with prosciutto from this huge chunk of meat. The paninis are good, but go for the coffee. Srsly. Seating is limited, and there's no bathroom here, but this place gets five stars anyway because I'd give it six or so otherwise. Unfortunately it closes when the University closes, so on the weekends and holidays (including Christmastime and now the summer months).
Its regulars include a mix of students, people who were students until very recently, random hipsters, more random hipsters, Young Urban Professionals, and tourist hipsters who heard about this place through the hipster home shopping network. (Seriously, how do American tourist hipsters hear about it?! It wasn't on Yelp..) And then there are just coffee snobs and probably like three "normal people" who go here, too.
Fortunately and unfortunately I have been ruined for coffee for life, now detecting anything less than perfection (I came here daily for like 8 weeks straight...) The next best thing in Vienna (that I've had), where I can get my fix when Couture (aka "Crack Coffee") is closed, is Orlando di Castello. Nevertheless, even if Couture ruins you for life for coffee, you really must go here.
They don't have an official website, but here's their facebook page: https://www.facebook.com/pages/Caff%C3%A8Couture/141085318010?sk=info
*And just because I'm American doesn't mean I don't know good (or bad) coffee when I taste it! read more