Koji & Nami's place is very nicely designed and decorated, very comfy, and we recommend their place for any guests who wants to have 2 bedroom. The bedroom upstairs is in Japanese style, and surprisingly comfortable.
Location-wise, it is somewhat secluded but still easily accesible by train and the map they provided is so accurate, you won't have to worry about getting lost. They thought of every detail, allow us to store our luggage prior to check-in and even provide a drop-off service to the nearest station upon check-out. Everyone at the factory were also very friendly and helpful.
Near the Keisei-Tateishi Station (nearest station to Koji & Nami's place), there are a bunch of food selection and we recommend to try the Taiyaki (fish-shaped cake filled with custard, red bean or sweet potato). It is so delicious compared to other Taiyaki in central city Tokyo. There are also drugstore, beauty supplies store, family mart available in the neighborhood.