The last time I was there was in May 2021 for a higaeri. A very popular onsen. Beautiful old little houses, a large shared bath, and there is also a separate women’s bath, with a passage from it into the shared bath. The views there are gorgeous, of course. And the water is pleasant. There are a lot of people, but the rotenburo is fairly long, so it did not bother me too much. I’d like to stay overnight there someday, but getting a room is not easy, of course :)