Kajsas Fisk, in English it means Kajsa's Fish, is a small seafood eatery in the Hötorgethallen. It provices a very casual environment, reasonable prices, and fresh seafood. Especially the fish soup is popular, which you can get a refill if you request. I usually take my guests to the place for typical Scandinavian seafood at a very reasonable price and genuine environment. Highly recommended.
Hötorgethallen is located by subway station T-Hötorget. It is a square and at the end there is a big cinema complex. Take the right side of the entrance into the complex and take the elevator directly down to the underground floor, where the "Saluhall" is located. Get off the elevator, turn left and left again, walk to the end of the alley, there is Kajsas Fisk. There is usually always a queue. The place is rather dark, and during lunch time hard to find a place to sit. But the food is wonderful.