I can confirm the recommendations for Byporten Oslo and Bergen City - both very good 3* properties, and a snip at 10K per night, with a free, generous, breakfast.
One tip - if Hilton says there are no reward nights left at a property, or a reward blackout, just call the hotel direct. Worked fine for me this summer, when the hotel was at nearly 100% occupancy and I was Gold.
Regards