Ken's place is absolutely lovely, it's clean and filled with everything you could want in your stay in Japan. Only a 15 minute walk from the station, down a river, surrounded by quaint houses and beautiful nature. There are plenty of restaurants and shops nearby so that despite it being just outside of the busy day-to-day of Tokyo, you never feel isolated.
Ken himself was a great host and picked me up from the aforementioned station, giving me a great introduction to the neighbourhood and flat. On top of this, he made great recommendations and offers of things to do nearby. He was always reachable if anything was wrong, which it wasn't, but the reassurance was most appreciated.
I can't recommend this place enough if you're going to Tokyo and want a break from the mental city life at the end of the day.