Upon stepping foot into Oslo, I slipped and fell on ice and dislocated my knee, I can speak very thoroughly to the apartment, because I spent a week solid in it, only leaving once (I had to try and see a little of the city after all!). It basically became home for that week, and it was a lovely place to be. Very well equipped with everything you'll need. Close to grocery stores, and right around the corner is a bus stop which (if you can't/don't want to walk) will take you straight to the center of town in only 3 stops.
The place is very quiet at night and the beds are comfortable. One thing is that the small bed is on the ground, but is only a problem if you can't bend your knee ;-)
Beautiful living room is high ceilings, and lots of plants. The bathroom is great, just as described, with heated floors (especially nice in the winter).
Just a great place, with really kind and communicative hosts. I would definitely stay again.