They hardly come more traditional than this inn split over three buildings, the oldest of which is the riverside 1936 No 1 Annexe. Guests have 24-hour use of adjacent Takaragawa Onsen: early-morning bathing gives you the opportunity to experience that sense of real tranquillity that can be hard to grasp during crowded peak times.
Note that the dinner banquet may include bear-meat soup; if you'd prefer not to eat this, ask for no kuma-jiru (熊汁) when reserving. A shuttle service is available.