Jazzve Cafe
Very popular coffee/tea house, sort of resembling Starbucks and other North American coffee houses, serving lots of desserts (costing $1-3), alcoholic and non-alcoholic drinks.
The big outdoor location by the Opera also has an attractive "VIP" section (with strict "face control"), the same menu, yet more expensive. Indoor also has a dress-code - absolutely no sneakers and sweatpants.
Other locations include:
Address: 8 Moskovyan Street
Phone: (374-10) 56-15-08; 56-05-41
Address: 32 Tumanian Street
Phone: (374-10) 54-54-24