Though we were late, K and his dad waited patiently for us to tour the house and briefed us on how to use the appliances. After checking in, K's dad even offered to drive us out of the narrow lanes to the main roads to proceed to return our rental car, realising we were unfamiliar with the place. We thought that was very kind of him.
We enjoyed the spacious house in a residential area which is very near to a train station and convenience stores.
The only imperfection is probably that there's only 1 bathroom to share amongst the 7 of us. However, this could be mitigated by visiting nearby onsen.
And remember to observe all the house rules.