I come to this place frequently as it has become a cult at my work (which is very close to the tea room!)
My favourite is the Matcha Macchiato with tapioca. It is quite thirst quenching and not as sweet as it sounds in a good way! The teas are brewed. I believe there are a few options for the toppings, like red bean (which was also good). I have also tried the Original Brew and Vanilla Brew. I wasn't a big fan of the Original Brew as I found it a little bit diluted.
The space inside the tearoom is a little compact although the interior ornaments are very cute and gives off a zen atmosphere. The staff are very nice and friendly. They serve the drinks personally and even hold the doors for you as you walk out.