Excellent property, nothing of major fault. Keita makes it very clear that his house is what it is, and while it may be a bit old and cold in the winter, Keita more than makes up for it with his warm personality! (There's also a kotatsu if you're extra nippy!). Rooms very clean, fast wifi and a decent kitchen space for cooking.
Location isn't the best, but this is made clear in the description. It's a relativley rural area (by Tokyo standards), but plenty of amenities, and about a 10 minute walk to the nearest big station at Takahatafudo with access to Shinjuku and Tachikawa. The hill can be tricky, but using Keita's tips and it's a breeze.
Only downside is that because it's winter, the downstairs area was VERY cold at night, so most of the time was spent in the room. I imagine that the summer would be much more social, as Keita made it out to be. Slightly cluttered downstairs, but that's a nitpick.
Loved the stay, and would definitely visit again.