Grotto is close to where I live so I come here frequently! I usually order the Okinawa Brown Sugar Milk Tea, which is delicioussss! I'm a big fan of their large and small mix of tapiocas!
Service is pretty good, and the staff usually offers refills for the popcorn they provide! They also have tonsss of asian magazines for you to enjoy along with the free wifi.
The only thing I would't recommend here is the food.