I've been here a handful of times now. This is kind of our go-to place for a celebration. My fiance loves sushi/sashimi and he is never disappointed with an order from here.
There are a few vegetarian options here, which is great. I'm love the buttered enoki mushrooms and usually order one of the soup noodles (udon or soba) while he orders an omakase to share (if we are with other people) or a smaller portion of something else if it's just for himself. The omakase comes with a seafood soup, which is presented in a small teapot, which is quite cute. The omakase itself is good for 2 to share as there are two of each type of fish.
Aoyama is a small and cozy restaurant, so it's best to call in to make reservations. I have been lucky so far with making reservations even on the day of, but I see people waiting at the door each time I am there, even on a week night.
As the restaurant is quite small, I would go with no more than a group of 6, unless you want to book the restaurant for a private party (which I've never asked about).