A great tea house with an extensive selection of teas (whites, greens, blacks, blues and reds) from around the world. It's the premiere place in Montreal to drink tea (especially since O Chai on St. Denis went out of business a few years ago). The people who work there are knowledgeable and helpful and they even greet you with a small taster cup of the tea of the day. (And you can buy tea in the adjacent tea store)
My only gripe is the price of tea in China. They have a great selection but you have to pay for it. Most of the teas cost between 5 and 7 dollars per single pot. Factor in tax and tip and you're looking at 8 or 9 dollars which is more than you'd pay for the most expensive capuccino this side of Moscow's Starbucks. Of course that's for an entire pot of tea but that's still pricey. So I don't go that often but I enjoy it when I go. Although it's generally pretty crowded and sometimes hard to find a table in the cramped yet pleasant space, they have free internet and it can be a nice place to get some work done in the off hours, especially for people like myself who enjoy the distraction of pouring myself a new cup of tea every few minutes.