For me I enjoy an eatery with soft ambient music, lots of lighting so I can see what I am eating, Comfortable chairs and a decent size table. Conservative decor as in soft shades of colors.
What ambience and decor do you like in a restaurant?
This is my dream restaurant...
Back in the late 1930's there was a restaurant called Don the Beachcomber that started the Polynesian Tiki themed craze in California. Some of these restaurants are still around, and I enjoy them because they remind me of my childhood. They have wonderful Puu Puu platters, umbrella drinks, and a Scorpion drink in a flaming volcano, for two.
Clean is good! Most of my favorite restaurants are on water. Either the beach, or a river. They are casual and open air.