Helsinki has a LOT of bars, Finns like to drink
It really depends on what you prefer and on your timing... My favourite of the local specialities is the pub tram Spårakoff, an historic tram that has been converted into a pub. It operates along the main tram routes in Helsinki. But no snacks available there. An Ice Bar also available, but it seems there's one in every city these day.
Ahjo is nice, it's a combined bar, lounge and night club in the hotel Klaus K. I also like the Belge Bar & Bistro in the city center, good beers and comfy sofas upstairs.
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