Other reviews have said it all: this is one of the best vegan cafes in Tokyo. It has a pleasant, spacious interior with a wooden floor and plenty of natural light coming in from the park it faces. The food is fresh, delicious and I think mostly organic. It's great to see a vegan restaurant gently promoting veganism and organics to a crowd which I imagine are mostly not vegan. And it's not hard to see what brings so many people here.
However the address is wrong, and it's actually a few minutes walk away, with the entrance from another street. I'll update HC, but for now here is the correct address.
This is well worth the walk and bus or train to get there.Pros: delicious food, well priced, pleasant interior
Cons: location wrong (to be updated), a bit of a walk (but worth it!)