A small red wooden cottage on the Sibelius Park shore, north of the centre. The interior holds maybe a dozen people; everyone else sits on logs in the garden, by an outdoor fire pit, with the bay opening in front. The signature is the cinnamon bun — large, sticky, dense — and the coffee comes with a free refill.
In summer the queue can be 20 minutes long. Combine with a walk past the Sibelius Monument. Bring cash; the place is famously old-school.