We ate here yesterday for lunch. There were only 1 cook and 1 waiter/front, but there were 2 other groups people there at the time, so service was reasonably fast. Staff were friendly and the place was clean. I wouldn't expect to see locals there because it's probably quite expensive in Moroccan terms.
We had the veggie burger and the spring roll. Both dishes were very nice - I wouldn't hesitate eating either again. Fresh juice blends were ok, but nothing special.
After a week of travelling around in Morocco with enough veg tagines and cous cous for a lifetime, it was refreshing to have this much choice from a menu
Would recommend Earth Cafe strongly.
And I'm now keen to try the one in London too!