Apparently Japan has up to eight million abandoned houses. In Japanese they're called "akyia" (空き家).
Until very recently they were rarely renovated. But a couple of foreigners living in Japan are doing YouTube videos on rural Japanese houses they bought cheap (or free) to renovate. (There are also Japanese YouTube channels).
I'm wondering if any have been renovated into a hostel or guesthouse that I can go stay at?
Anywhere in the country. The cheaper the better though. In fact somewhere I could volunteer to help out in exchange for accommodation would be awesome.
Googling is not finding much. I think there are also places named "Akiya". Maybe some people with more Japanese experience than me would know where/how to look?