The flat is well situated, 15 min walk from yamanote line and subway. It is of a good size for 2 people, is very quiet and the beds are comfortable.
The kitchen has the strict minimum for preparing pasta, soup or fried eggs, but don't expect more.
There wasn't much communication with Hisao but the sandwiches + food + cookies in the morning were really useful for us. He drove us to the station at 6 am in the morning.
I would stay there again.