In spite of its small size, Tsaa offers quite the variety of tea leaves. They have a great selection of green teas and their London Fog is one of the best in the city. Tsaa also sells food. Their sandwiches are delish (though a bit on the expensive side at around $6-7). They also sell gluten free chocolate desserts.
An amazing Americano in the PATH! Their coffee is consistently outstanding, the service is always friendly and prices are good. Lines can be quite long (and a little awkward since you're essentially in the middle of a busy hall) but it's a great place. Cash only/
The coffee and lattes here are pretty good (you're getting good crema and milk art). The reason to come here is the donuts. You need to try these donuts, they are wonderful. A dozen is only $4 and worth every penny.