Masami is great host, my family took 6 people room for 5 of us, cause we tought Japan room and bed is small, but....., when we arrived, the space is spacious compare to most of Japan Apartment, about the cleanness, you don't need to complain about it, it is perfectly clean.
If you stay at Masami's place, just pack light, since our great host provided us with most our daily necessities needs, from laundry to dryer, full functional kitchen.
The place of stay is at nearby Hatagaya station (5-8 mins walking) surrounded by 24 hours stores and restaurant 2 bloks away. The place is safe and peaceful and quiet.
Pack light as I reminded before because luggage can be burden to walk at Japan while at road or complicated Shinjuku Station
Overall, I will not complain, but give thumbs up all the way for Masami to provide such a great room and fast responses on all the trouble our family met at Tokyo. Will live to come back when we come back to Tokyo again. Thanks a lot Masami