We stayed at Fjallnas resort for a friend's wedding reception and spent 2 nights there. Though the spa resort is difficult to get to (we rented a car from Tanndalen or you could rent from Roros, Norway), it is a perfect retreat away from a hectic city life where you have great access to hiking / trekking (there's a beautiful waterfall just 5 minutes away).
My husband and I loved the bright beautifully decorated room. We stayed in the premium doubleroom which had a nice view of the woods/lake. The room have comfortable clean beds, strong shower, wifi and other basic amenities. The staff were friendly and accommodating.
The breakfast provided was simple but wholesome which we could pack for lunch and bring along during our hike. We also enjoyed the heated outdoor Jacuzzi which was heavenly as you sit in the warm water in the cold with unrestricted view of the mountain and lake. Very peaceful.
Would definitely return if it wasn't so far away.