I've been going to The Diner for years, and have never been disappointed. My favorites include the Artichoke Dill Bake, Sweet Potato Fries, and lately, the Mesculin Salad (which is huge -- enough for several servings). In the past, I've also been a big fan of their breakfast, but it's been a while so I won't comment on specifics.
The desserts I've tried have been excellent, and a family member even liked one of their cakes so much that she has since ordered several full sized cakes through The Diner's baker.
The atmosphere is very laid-back, especially when it isn't crowded. I've seated myself, taken the check up to the counter to pay, et cetera. But the experience is always enjoyable.