My friends and I stayed at Kentaro's place for 1 calendar week for our Japan trip.
Pros -
Kentaro/host is very responsive and hospitality for our stay.
The home had plenty of beds (1 of the beds was broken upon arrival), and there was 3 floors of restroom utilities. (storage space is very limited)
Plenty of utilities/home appliances for a big group.
Nearby train station is fairly not busy.
Cons -
Inconvenient location (huge hill to get in/out of the train station)
Neighborhood is super strict on noise. It was not very comfortable for a big group to socialize in the area (thin walls) so if that is something you're looking for, this is not the location to do so.
No dryer/drying area.
Overall, this location is recommended if you need a place to just sleep and store stuff. Kentaro is an amazing host but the location/neighborhood isn't as kind as him. I wish I could add more positive notes but this is my honest review from traveling as a group in Japan.