My experience is that I usually get bumped up one category at Oslo Plaza, which have three classes of rooms. For work stays I prefer not to get a business class room, as there is one thing that annoys the living daylights out fo me with the setup in the room; the chair, striaght metal legs down into a carpet. That chair isn't moving anywhere once it sets into the carpet.
Other than that I've stayed at Beitostølen recently, nothing special. Oslo Airport upgraded me once in maybe 5 stays.
I never ask for any favour and I certainly never demand anything, primarily because many of the explanations given are so thin that I'd rather avoid getting myself riled up at being served an obvious lie....
-A