I can recommend Øystein's place. The apartment is located just a few walking minutes away from the King's castle and the train station "National theater", and very close to a discount supermarket and discount bakery chain. Øystein's room looks just like in the pictures. It was clean when I arrived, the kitchen is functionally furnished with most of the necessary stuff that one needs, and both wi-fi and shower worked flawlessly. Øystein was a very decent and reserved host who was friendly and hospitable. All in all, anytime again.