I travelled with 2 friends and there was ample space for the 3 of us. The house is located about a 10 minute walk to Metro Shimo station and about a 20 minute walk to JR Akabane station.
House was extremely clean and Mariko was an exceptional host. She was very prompt in her responses and was thoughtful in what she had prepared for us as guests.
As mentioned in a previous review, the restroom is upstairs attached to a 2 bed room, which means you will have to cross through the room to use the toilet. However, that would not hinder me from wanting to stay here again if I have the chance!