I visited here in 2011, so apologies if things have changed since then!
I was visiting the Yayoi Museum & Takehisa Yumeji Museum and this was in the area. It was VERY hard to find! I wandered around for quite a while trying to track it down, and it was in the side of a side street off the main road in Nezu. Maybe helpful to print out hte name and address in japanese to ask a local, as I got lost!
I was the only visitor, and not entirely sure I had the right place, but after showing the lady working there my translated sheet of all the things i cannot eat (vegetarian, no cheese!), the lady said that was all ok.
I ordered the set and got a bowl of brown rice with a bowl of miso and some spring rolls and pickles. It was all really tasty, especially the spring rolls which were crisp and flavoursome. I then had a cup of sweet tea afterwards. Ir was all lovely, but very small portions. I was just having lunch, but wasn't completely full.
I wandered into the shop afterwards and they had lots of veggie things there.
All in all, fine if you're in the area, but don't go out of your way.Pros: Beautiful crockery, Delicious spring rolls
Cons: Difficult to find, Small portions