Loiste is has a wonderful terrace in the summertime. But also during this time of year it's worth a visit. Also from inside you have a beautiful view over the city. From up here you can see Mannerheimintie, Kamppi Kauppakeskus, Narinkka and more. And if you come here in the evening you have the nice asset of seeing the city's lights (something that doesn't have the same effect in summer).
They serve some nice cocktails up here and you will also find some good wines and beers from the tap.
Have a nice weekend!