It is very rare to find a place which caters specifically to travellers with a baby! A cot and high chair were provided which allowed us to travel very lightweight. The house has 3 levels. We had 5 in our group with the baby and parents using the two bedrooms on the top floor, grandparents on the ground floor with their own bathroom. The layout of the living/dining and kitchen being on the second floor means those on the bottom floor will not disturbed by any noise from the top floor.
The location is very convenient to the subway, multiple supermarkets, places to buy bento and small local bars/restaurants. No house instructions were provided, so visitors who cannot read Japanese may have trouble using things like the automatic bathtub, toilets, bathroom exhaust, remotes for the lights and A/C, and understanding the garbage disposal rules. Hopefully the host will change this for future guests.