Yu yu is an enjoyable experience all around. The ambience is nice, it is well decorated, clean, and quiet. The service is great - the servers are all friendly and the food is delivered at a good pace.
Obviously, the most important aspect of the experience is the food. I have yet to find something on the menu that I haven't enjoyed. Tonight, we tried the big eye tuna with avocado sauce (a current kushiage special) - it was excellent, I'd highly recommend it. Make sure to request their special ponzu and misokatsu sauces, they go great with almost anything you can order.