This friendly onsen hotel boasts some excellent facilities, including mountain-view rooms (mostly Japanese style), coin laundry, and English-speaking staff. The lovely rotemburo (¥520) is open to the public from 11.30am to 8pm, and there's a family-style bath deep in the forest (¥1030 per hour). The location, near Ebino-kōgen village, is superb and the restaurant makes tasty meals.
Rates may be lower depending on meals, which might include kaiseki dinners, so ask when you reserve. Also ask about shuttle-bus services serving trailheads and train stations.