In reply to Phil Tucker:
Depending on the standard you want, air bnb is the best for apartment style accommodation.
There's luxury stuff at the ski slopes but it gets pricy.
Granmo, Magalaupe and Driva Hytter are the go to places for weekenders. Driva Hytter is the cheapest, but so far Magalaupe has proved to offer the best value. Granmo closed their cheaper apartments this winter and have only been offering expensive new huts, may be different next year tho. The owners at Granmo also have the motel in town (Oppdal Gjestetun) which was recently renovated and a bit experimental at present.
These are all well suited to Drivdalen, but if conditions are very good and you're after something big then there is trollheimsporten and breesgard camping on the way to Gjøra and Sunndalen that might be worth looking at for all round flexibility.
Drop me a PM if you want any more info