I just got back from lunch with some colleagues at Clifton's Cafeteria. Clifton's is located in downtown LA, on 7th and Broadway, just a hop, skip and jump away from my office. I don't go very frequently, but everytime I do go to Clifton's, I feel like I've been transported back in time to the 1940s. I feel like Cary Grant is going to sit down at the table across from me or offer to go get me some more jello. The romance of the place is not in the quality of the food but in the atmosphere. So don't go anticipating a 5 star meal. Go to get diner food. I recommend the vegetable soup.
I love being in places that evoke those times... like L.A. Union Station. Wonderful!