Happened upon this cute little cafe last week. It's run by a charming Argentinian named Silvio and, as far as I know, it's the first yerba mate cafe in Toronto. I don't profess to be an expert on yerba mate but they serve this low caffeine herbal drink in traditional gourds or in a french press. I found the taste somewhat like an oolong tea. They also have Argentinian pastries and sandwiches. It's a very cute, serene little spot. 1078 Queen Street West.