I went for the opening weekend of High Tea and I could not say more good things about Adda, my experience was above and beyond. They had a wide range of unlimited teas, both hot and iced with one specialty. My personal favorites were the peach and mojito. They prepared an all vegan tea tower with lettuce wraps, toast with a perfect pea spread, and their signature power muffins.
Update:
Having a good server makes all the difference. Our 2nd visit was not as fantastic as the first.