Definitely old school Lawrenceville, a good place to get a reasonably priced breakfast with super friendly and attentive service. We went at 9:30 am on a Saturday, which is apparently the changing of the guard: every patron from that point on was hipster.
There are excellent specials posted, but also plenty to choose from on the regular menu. Our food was well prepared typical diner fare, and our servers came by regularly with hot coffee and ice water. Barb's is a dependable breakfast choice at a modest price.