Stayed at Kevin's place for my last weekend in Japan. It's close to 7/11, small, local restaurants, and the Hatsudai stop on the Keio New Line. It's exceptionally easy (and cheap) to get to Shinjuku!
Kevin is also super responsive and provided all the information for an easy check-in. The Pocket Wi-Fi worked pretty well and, with it being free to use, I have zero complaints. The Wi-Fi in the room was great too, and the water hot. Kevin also provides dishes, coffee, and a complimentary kettle for use.
One thing to note, most GPS applications won't pin the exact apartment, so it's important to meet drivers/uber drivers/taxis outside, or to use the address in Japanese. My driver/taxi didn't know where to take me until I showed him the address in Japanese, and I had to walk a couple doors over to meet Uber Eats drivers more than once. Could be my GPS (or their's), but just a heads up.
Also, there isn't an elevator, so keep this in mind if you need additional accessibility.
Finally, the walls are a little thin, so you'll be able to hear the neighbors during the day. This wasn't an issue for me as they weren't disruptive or belligerent, but figured it was worth mentioning for some.
Overall, this place is cute and clean, located in a central location. Perfect for 1-2 people.