This place is located underground by T Östermalmstorg when you exit toward Stureplan and I've passed it several times but just tried it for the first time yesterday.
It's more of a to-go place since there's hardly any seating but definitely worth a visit. I had the shrimp salad which was delicious - extremely fresh and with such a generous portion size you really can't ask for more when you're in a hurry. read more