Location was within walking distance of a station with a JR line, so if you have a JR pass, you can explore the stops at the Yamanote line (Shibuya, Harajuku, Shinjuku etc.) using your pass. Masaki and Haruko's place was easy to locate. If you're traveling with heavy luggage, do note that the walk from the station is a bit uphill. The location is quiet, and it was nice walking around the area. There is a Lawson convenience store within walking distance.
As for the house, it was clean and comfy. Masaki and Haruko labeled their electronics with English labels, which were really helpful. They provided clear instructions how to use the appliances, too. They have Japan guide books and a ton of other books you can read. They provided coffee and welcome treats like green tea Kitkat and cookies.
Communication with them was seamless and they reply within minutes. We will definitely stay in their place again when we are in Tokyo!