hmm... I don't really have a...
hmm... I don't really have a favourite one. (most of them suck) A couple that I like are two bars, Tori (fredrikinkatu) and Soda (uudenmaankatu), and a nightclub called Kerma (Erottaja) If you like cocktails, Sling Inn is the place to go to in Makkaratalo, building next to wtc plaza in the center of the city. It's open all days of the week and on nights like Sunday to Thu. the customers are mostly people that work in restaurants themselves (or just plain drunks --same difference!) If you like clubs (like trance, house, etc.) you should look for the flyers that people give out usually in front of or near Stockmann and in some clothes stores. There are some Clubs every weekend, sometimes with morning parties that run from 5a.m. to 12p.m. and the chill out party's usually at Kerma on Sundays (for hardcore party goers only, I couldn't do it!!) Another one is at CTRL I think... not for sure...
