Katsuo-san is a super host. He responded so quick and very helpful, and friendly.
The house itself is quite new, in a quiet neighborhood, very close to Shimbamba Station, which is only small train station. But, one important thing to me, the train line there is very convenient to return to Haneda airport or Narita. Also to transfer to Yamanote line in Shinagawa which connects to favourable places in Tokyo.
Just one thing I need to make notes to the guests especially women with big heavy suitcase, the house is at second floor, and it will be very difficult for them to carry or bring down the suitcase. Other than that, Katsuo's place is a great place to stay while you are in Tokyo. I hope one day I can stay there again.