I actually looked into that property once; there was no way it was going to happen for a number of reasons. I ended up buying a house in much better condition in another area.
I really need to do a video about the topic or something. There are many, many landmines with stuff like this. For a very TL;DR and assuming every single other thing is perfect: owning a home does not give you the right to spend any extra time in Japan nor grant a visa; you are on the hook for taxes, fees, septic maintenance (though the above property may have been a pit toilet; I don't remember), and other bills which will have to be paid from a Japanese bank account. There are also certain neighborhood association obligations, property maintenance, fire control, etc.
Not all of us gaijin are tourists. I have permanent residency and I would love to find a cheap house far from the noise and smoke. Do you know where I can look up houses like this?
Building standards are improving but, yeah, slowly. Kominka over 100 years can have really good structure if well maintained, but it definitely would not be something who isn't already knowledgeable about them. The majority fall into ruin.
I watched a video from an American guy who did this. But he already had residence, and made it very clear that if you don't have residence, doing something like this would be a waste of time and money. He bought a massive junker of a house and it took him like 2 years and a bunch of help to make it livable. Still a good video, and still a cool idea, assuming you have certain ducks already lined up. Definitely not something to do on a whim.
I looked at doing something like this in quite a few countries, and skipped on Japan pretty quickly. Happy with my decision though.
Not sure if they're still doing it, but a few years back (holy shit maybe a decade), Italy was even offering to pay people to move there. But there were massive conditions. Like, you had to buy a historical property, maintain it to their standards, and open a business to boost tourism, or something along those lines. I looked into it and was kind of intrigued, but it seemed pretty obvious it was designed to draw rich expats, not average losers like me.