is there a spa and/or massage service at this hotel?
No sauna/spa available, unfortunately.
I was really surprised that there were no saunas available in the 3 hotels we stayed at in Oslo. In Finland all the hotels have it, no exceptions.
Get an answer from Radisson Blu Hotel Nydalen, Oslo staff and past guests.
3 Days in Oslo
Guide to Oslo Outdoors
Guide to Oslo for Families