We stayed at the Cumulus on the way back from Rovaniemi to Helsinki (8-10 hour drive in snow). It was the PERFECT spot for a family, and for the location on the way back to Helsinki. The pool area was fabulous, especially for our son, and the saunas and steam room were all great. The breakfast was also very, very good, and the room, while spartan, was adequately comfortable and we even tried the bowling at night.
Overall we would definitely stay here again if we cross paths in the future, perfect stop over type location to refresh and invigorate you on the drive. Lots to do and an amazing pool area. Highly recommend, just don't expect anything fancy in the room.