Great house, terrific location.
The house truly matches the pictures that are posted. I say this as we've stayed at other places and the pictures and actual experience did not align...it's so nice to not get a surprise when you show up.
Kota is also a great host! He met us at the house to simplify check-in and gave us a tour of the house including going over how to use everything, such as the washing machine and dryer. He also shared a map he put together with locations of various places near by plus some restaurant recommendations - extremely helpful.
The house itself is full of charm, and I really like the personal touches from Kota's family that make of the decor of the house.
Also, GREAT neighborhood. Head north, away from the station, and it's a great place to wander. We also really liked Uguisudani station. It's on two convenient lines but is small enough that it's never really packed yet close to great transfer stations (Ueno and Nippori).
Would I stay here again, absolutely.