The is a nice flat (more below) but its location on a pier right next to the Aker Brygge Marina is the real draw. There is a ton to do right in the neighborhood and it is easy to walk to many fun and historic places in Oslo. Something I did not expect is that Oslo Treet is right out the window (warning, it is addictive to look at:).
The flat is nice with a comfortable couch and a small table. The kitchen is small but functional. The appliances are nice although a toaster and/or a microwave would be nice additions. The bed is high quality but note that it is the softer Norwegian style. Overall, this is a great place to stay when visiting Oslo!