I've visited about 10 veg places in Tokyo so far, and this is definitely my favorite. The atmosphere is really warm and relaxed and the portions are larger than most other places.
The tofu sandwich and lunch curry were both pretty average, but the Hawaiian fried rice was very good. The peanut butter muffin was dry, but the tiramisu was good, and the banana pudding bread and apple cobbler were outstanding. They come with two big slices and some sort of whip topping that was very tasty. They also sell bags of maple glazed nuts, which were very good.
For dinner, definitely ty their pasta. It's hard to come by vegan pasta here, and they have a great angel hair pasta with a vegan basil cream sauce. Their sauted potato appetizer is also amazing.
If you're into celebrities, I hear Moby likes this place.