Celiac-safe. I like to order my cheeseburger in a foil tray so I can eat it with a fork and knife along with the French fries. I ask them to put my lettuce and tomatoes in a separate container which I eat as a salad. Yum!
As for the atmosphere, Five Guys is always so minimalistic and echoes horribly. Some locations have a bad/loud playlists — so take it as a picnic!