Not really having the time on this leg of our trip for a full tea ceremony (Chanoyu), we were looking for some way to still get the experience. Mikiko-san's 60 minute session fit the bill perfectly. The whole experience was mesmerizing, and then making matcha for ourselves was really fun. A perfect way to entertain teens, as well. Mikiko herself is very friendly and enthusiastic.
The location is in an apartment building but GPS found it easily. It's about a 15 minute walk from Roppongi Hills. On Mikiko's recommendation we walked back through Arisugawa park, which was bucolic, especially the turtle pond.