This is a nice place. The food is not the best Japanese at this level that I have eaten, but it is very good. They do both hot and cold dishes which is nice.
The service is simple, the establishment clean, comfortable and warm altogether. It is quite a small place and strangely - in my opinion - less occupied than the Soup sister restaurant across the road (which I have never been to - the queues are always far too long).
The food here tends to be a little on the sweeter side. Heavier than in other Japanese restaurants I have been to; however, having said that, it is one of my favourite in Dusseldorf. I always find myself going back every so often and so they must be doing something right.
Location wise, one can walk off the excess food on the way into the City centre. A good place to stop and eat with reasonable prices.