Sushi has become the new big thing in Iceland and the they keep getting better at it. Sushibarinn is a tiny sushi place where no more then 6-8 people can comfortably enjoy their meal without splatting any soy sauce on other guests.
The sushi is quite cheap, yet good. They have a wide range of Nigiri, Inside-out rolls, Futomaki & Husomaki. If the place is overly packed and you want a little big more easy going atmosphere you can stroll to the coffehouse on their right hand and order from there.
Their "roll of the week" are quite a safe bet - normally consisting of 8 pieces for around 1100 isk.