Wonderful stay. A traditional Japanese ryokan, soft futon, lovely onsen (three private bath where you can reserve for an hour each and two gender divided bath which switches at 7pm so that you can try both), and delicious Japanese traditional food at your room.
The best thing about this ryokan is the architecture. Wooden three story building that is more than 100 years old. Three story wooden buildings are very rare and you can see that a lot of effort is put into it to keep at the level that they are maintaining (wood tends to bend with humidity and if you consider that this ryokan is standing by the river). You should check the ceiling, many types of Japanese wooden art.