Archway Cafe, Dumbo, Brooklyn
I probably go to Archway Cafe 2 or 3 times a year and I have been for many years now. They have really good sandwiches, salads, cookies and cafe latte. There's usually local art on the walls and it is frequented by locals. There aren't many restaurants or cafés that I suggest in the Dumbo area these days as many of them are a bit too trendy and expensive.
Archway Cafe, 57 Pearl Street