Super convenient and a wonderful place! Very close to a 7-11 (1 min away) the train station (6min) and Daiso, so if you may need anything or forgot something at home you could just walk right to the Daiso to get it. Also the Daiso is in a in a department store next to the train station where they also have others shops that sell souvenirs, makeup, clothes, groceries , etc. called "Itoyokado."
It's also very clean, and yes at first it may seem small but you get used to it in a day and truthfully, we were out of the house most of the day and the house is the perfect place to come home to and just rest. We were able to fit 11 of us, 6 adults, 5 children and 1 infant.
The only thing to be careful of if you have little ones is the stairs. It's pretty steep and some of the steps are narrow, this was easily amended as we made a rule for kids under 3 that they could not walk up and down the stairs by themselves.
The host were very warm and accommodating and answered all of our questions quickly. I would definitely stay here again in the future for a big group.