Excellent place to stay in Tokyo, very quiet and peaceful. A convenience store and postal office are on the way, this is very useful for withdraw money (both the post office and the convenient store have ATMs that accepts cards issued overseas) and the Tabata Station of the JR Yamanote line is very close.
Masaki and Haruko are very friendly and kind, attending all our doubts and concerns, but very respectful too, they will don´t bother you if you don´t need anything.
The place is very clean and have all you will need: dishes, soap, shampoo, etc. there are washing machine, a little refrigerator, microwave oven, and more. Even a confortable desktop and chair if you need to work with your personal computer.
The area is big in comparison with some Japanese hotels, you will not have problem placing in the floor up to 4 big suitcases, There are 2 individual beds and a bunk bed, kitchen and dining room. The pocket WiFi they provide was very useful and worked all time for us.
The only little drawback we found was a little uphill in the way, uncomfortable only if you arrive with more than one suitcase (but easy when you leave, because it turns into a downhill).
Anyway, this is a very recommended Airbnb, we would love to stay here again in our next trip to Tokyo ^_^ five stars!