Yonemama's apartment was easy to find. It's very close to Yotsuya sanchome station. Near by, there are Family Mart & 7/11. There is a Fire Dept. Museum above the station. Unfortunetaly it was closed when we were there. And there is a Toy Museum close by as well.
Yonemama is a very nice lady. The 3 storeys apartment belongs to her. She lives in the same building at the 2nd floor. If you need anything, just knocked at her door.
Her apartment is very very very comfy, spacey, has full of amenities....just like our own home. It's just perfect!! Unfortunetaly there is no elevator, so we had to carry our luggages to the 3rd floor. So it would be better if you don't bring big luggages.
She helped us called taxi company & reserved one for us to go to Haneda. And she even gave us cakes on our last day at her place.
We will definitely stay again at Yonemama's on our next visit to Tokyo.