The food is better than average and affordably priced but service is extremely slow and there's no rhyme or reason as to when dishes come out of the kitchen. They don't answer their phone any time of day and don't return calls so it's nearly impossible to make a reservation unless you happen to be willing to stop by before your dinner engagement.
But it's a nice small restaurant for impromptu sushi dinners for couples or a party of 3 or 4. That's probably their focal point anyway. They do have tatami mat seating and a fairly broad, if expensive, sake selection.
I would immediately give them four or even five stars if service was a little more organized and purposeful and if the staff could be significantly friendlier. There are only two servers even on Saturday nights during prime time, so perhaps that is the source of the problem anyway. Be prepared for long waits during your meal if you go with a group of 5 or more.