I went to this very quiet cafe for lunch which was good, and included a salad bar, soup, main dish and tea. All vegan from what I could gather.
Not super exciting and I probably wouldn't go again, but only because there's so much great cheap vegie food available in tourist-friendly Cusco. Totally an acceptable spot for a good meal.
Updated from previous review on Monday June 23, 2014
Cons: Food not very exciting