Hands down this hostel is Tallinn's best for that feeling of international traveller camaraderie. Basically a collection of open bunk rooms, it's cheap, central and friendly, and the foreign backpacker who staff it organise video screenings and the occasional spontaneous pub visits and some funky tours both in and out of Tallinn. Free sauna, kitchen, computer and WiFi. Laundry for a fee. Looking to stay in town a little longer? They've got rooms for that too. 

34 dorm beds €9.60/bed. Extra bed €6.40. No breakfast.