I have only tried their sushi roll. Food is very simple, but good- authentic is the right word. But it didn't blow my socks off or anything, and I didn't feel it was that special. Very clean, and good service.
Portions are much smaller than other places, which is just so Japanese. Prices are ok, some items can be more pricey than other places, given the small portions.
There is no washroom inside the resto, but they will provide a key and you gotta go elsewhere...I take a star off for not being able to provide the most basic thing that even some of the sketchiest food places have!
For me, it was 3 or 3.5 stars. If you're looking for affordable authentic Japanese, this is a good place.