Guu is exotic and boisterous but is genuine quality,
Everything is prepared with care, high quality food and distinctive. You may not like every item on the menu, and some will have quite unusual tastes, but it is a gastronomic experience. Native Japanese speakers and Japanese customs give you a true authentic experience of Japan, beyond the cuisine. It is pricey but worth what you pay for. Main caveat is remember this is popular and don't expect to not wait if its a busy time.