Cafe in Upper Eastside?
I'm on the same block. I recommend Choux Factory on 87th and 1st for both coffee and decadent cream puffs...as well as free Wifi. You can linger.
Directly across the street from Choux Factory is Glaser's Bake Shop. One of the oldest bakeries in the city and one of my favorites. Try the back & white cookie and a Cheese Danish.
Two Little Red Hen's also has very good baked goods and has a couple of small tables. Second Ave just below 86th.
DTUT has closed, but a new cafe is going to open there according to the signs.