Actually you will get 2 individual rooms under this booking. The rooms are quite small but as expected to see in Japan. Cleanliness can be improved (many hair falls on the floor and I found some used but unwashed spoons in the drawer). Amenities are quite well prepared by host. There is NO elevator so it will be tough if you have a heavy luggage.
The place is about 15 mins walk from Otsuka station but many stores nearby (7-11, ministop, family mart, drug store and fresh foods shop) which is convenient for you.
Nami is quick response to answer your questions and check-in guidebook from her is really helpful for your pleasant stay.