Akihiro's place is the upper level of a neighborhood cafe called 'Sen' run by another local, Chikako. A few others share the cafe space too at different times of the week. They are all very engaged in local community revitalization projects in the Yamato area of Aizu, and are extremely gracious and kind hosts. I benefited greatly from conversations (in Japanese) with Akihiro and Chikako during my stay there, and Akihiro was so kind as to give me a tour of the area one morning when I was free. He was also willing to share meals with me so that I didn't dine alone (I was solo traveling). This kind of hospitality is rare for many AirBNB's I think, and it was more like a homestay than anything else.
A few important things you might want to know about the place:
1. Because the building is used as a cafe during the day, no one stays there at night. I had the whole place to myself after 10pm on my 2 nights there. At this price it's quite spectacular, but solo travelers not accustomed to the Japanese countryside.
2. There are no convenience stores in the area and most places are shuttered, as this is a depopulating area (though the locals are working hard to revive it!).
3. Though there is no A.C., it cools down enough in the evenings in summer to be comfortable.
4. There is a bit of street noise from cars passing outside that is disruptive if you're trying to sleep with the windows open in the summer. Earplugs were a must for me.
I think this is a great place to stay and wish I'd had more time to take advantage of the community events and farming activities Akihiro offered to make available to me. I also think if you're traveling as a pair or more that it might be more fun.
Also, I can't thank Akihiro and Chikako enough for how welcoming they were!