Simply: Diner feel, diner menu, diner food.
That said, they do have a separate 4-page gluten free menu that, surprisingly, offers a wide variety of GF options (not just salad) all the way up to dessert.
Service is very good and we seemed to have more than one person tending to our table.
The inside is small and crowded, but they do offer outside seating.
If you have a gluten allergy, definitely a place to add to your list.