I loved my stay in this flat ! There was everything I needed (towels, dishes, laundry..), the bed was enjoyable, the flat was clean... Everything was really good ! Also, the place is very well located, you can do almost everything walking : 20 minutes from the central station, from the opera, 15 minutes from Aker Brygge (the port), 10 minutes from the royal palace... There is a supermarket in the street, buses and trams.. If I go back to Oslo, I'll go there again !
The only small "problem" is that the washing machine is really close to the shower so you don't have that much space to shower.