Popular is a nice small cafe in Vana-Viru street in Old own, located close to McDonalds. A modern design, small tabes and sofas and new-age or underground alternative music are the best way to describe it. They offer a variety of alcoholic and non-acloholic drinks with reasonable prices. One of it's most popular features is a waterpipe rent (I think they ask about 70 kroons for an hour) + you can have your choice of tobacco. They also have a free WiFi. There's nothing special about this place, but you wont be disappointed when you go either.