Look at Sthlm with a
beer in hand
Why locals love it
Was once the tallest building in Europe and is today the tv and radio sender, however it has a cafe and restaurant at top with a fantastic view over Sthlm! Only packed at Christmas so it's great just to go there an evening or a Saturday to see Sthlm from the "sky".
Why you should visit it
It's not too big and families usually only hang out at Kaknästornet around Christmas when they have amazing Christmas food. A hidden treasure in plain sight, since you are able to see the towers for most of Östermalm, Gärdet and other parts of town.
If you are not there for Christmas I would just recommend a Swedish fika (coffee/tea with a kanelbulle (cinnamon bun) or other biscuits of some sort).