We were 2 families of 4 adults and 7 teenagers.
Pros - this house has enough rooms and beds to accommodate all 11 of us. It provides us with all necessary amenities like charging cables, universal plugs, card games, small n big heater at the room, a file full of instructions of how to the electrical appliances, places to eat near his place, popular places visit in tokyo.
At first it was a bit difficult to find place, however after we have checked in, this place is very near to Ochiai Station and 7 eleven was just around the corner of road.
We also like the door locking system. You just need to key in the password to open the door. No keys needed, hence anyone can just go home anytime.
cons - there was a smell from the kitchen sink it smells like pee. The carpet in the living room looks dirty.
we would come back and stay in this house next time if we have many pax. Overall we like place for its location and reasonable price.