Don't know if you can get contact details on that other platform though, and googling Japanese places is not going to be that straightforward unless you speak the language.
@Antanicus a few years ago, I did two homestays with people who host foreigners for language exchange. It was fun, but of course they expect to spend time together learning your language.
@Antanicus btw, if I had a proper guest room i would have already offered it... My apartment is a tiny studio and the rent costs the same of a 3 bedroom house in a suburban area.
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