Had dinner here when staying at the nearby Scandic Paasi, and it was a wonderful meal. They serve a traditional Finnish lunch, and in the evening like to, as the chef told us, "Have fun with the food": taking traditional local ingredients and giving them a modern twist. We had great fun with the food, too! The Arctic char that I had was one of the best fish dishes that I've ever eaten, and I couldn't resist trying out everyone else's dishes, too - salmon, risotto with chanterelles, and great schnitzels (apparently a Kollio speciality, which I'd had the previous night, minus the scampi and seafood sauce that it came with here, at nearby Savel) with no disappointments at all.
The service was great throughout, our waiter was very attentive and helpful, she explained all of the daily specials and the desserts for us. The chef also came out to chat to us about the food - I think it was obvious that we really liked it!
A lot of the food seems to come from the market hall which is just a couple of hundred metres away (and which is also well worth a visit), so they start with great ingredients, but they clearly apply quite a lot of talent to them to come up with such great dishes. Their desserts were excellent, too. I can't comment on the selection of wines, as we were thirsty and drinking beer or cider (also very good), but I can't imagine they would be anything other than very good. The coffee was excellent, even by Helsinki standards, but overseas visitors should maybe note that they don't have an espresso machine (so no cappuccinos etc), but make filter coffee instead.
While not cheap, dinner was very good value: we paid about 40-50 Euros each, including drinks, which seemed right by local standards. In London you'd have to pay probably three times that to get anything as good as this.