I had read about this place on HappyCow and was in town (June 2014), so I went in for a look. Here's my Kotuku review.
It's at the entrance to a yoga studio, just off the main drag (State St). The space is rather tiny, basically consisting of a drinks counter and a bench and a few seat stools. To one side is a wall shelf stashed with a few packaged products for sale. To the other side of the counter is a fridge with some packaged salads and bottled juices for grab n go. So it's not much of a restaurant, but if you want to drink, then it's good.
I got a green smoothie, which contains herbs and tea along with kale. It tasted alright -- healthy.