I didn't have the option of 4.5 stars, only 4 or 5, but that's what I would have given. Overall, the location was a modest inconvenience that required an extra leg to get to major stations, and because it wasn't near a station, it didn't really allow abundant options within walking distance (still, there is a market, McDonalds, 7-11s, and small stores/eateries), but the great price and options with laundry and a kitchen outweighed that.
Cons
Tatami style seating on floor (nice and fit with the design of the house, but not if you're not used to sitting on the floor)
Small but good size by Japanese standards (more than 4 may be difficult)
Not at a major station/attractions (but only a couple of stops away)
Difficult to find, esp if arriving at night.
No departure day baggage storage (Sagawa at Skytree [2 stops away] was where we stored ours)
Pros
Laundry so you don't have to pack as many clothes!
Kitchen with all necessary utensils/wares
Responsive host
Ultra clean
Very good price