My father and I stayed three nights at the Izaak Walton on a trip from Texas to Glacier National Park and return. The Izaak Walton is an old railroad inn, now privately owned but still used by the railroad to house snow-fighting crews in winter. Although small it is a full-service hotel with the "Dining Car" restaurant and "Flagstop" bar downstairs. (Accessibility note: No elevator. There is a wheelchair lift to allow access to first floor where the restaurant and four guest rooms along with a public handicap-accessible toilet are, but other facilities are not readily accessible.) The lobby is very big with a wood-burning fireplace and scores of books. Electronics are not welcome there, but there is wi-fi and TV downstairs in the Flagstop bar.
The setting is majestic, there are mountains on all four sides. We drove up, but many travelers arrive on Amtrak...the Empire Builder stops a short distance away, and the hotel van meets the train when passengers are expected. We were able to take one of the Glacier Park Red Bus tours directly from the hotel...highly recommended.
To the best of my knowledge this is the only hotel in the Glacier Park area which is open year-round (it's a Mecca for cross-country skiing in winter). The setting is truly isolated, but if you want to disappear (no cell service!) into beautiful country for a few days, this is the place!