Very pleasant atmosphere with candles and sweet orange lights. You will eat under a veranda wich can be roofless by summer.
Waiters are very polite with very good manners, you will have the feeling to be in a five stars restaurant.
Courses are very delightful as well : you can have it in a meal (from 20 to 40 euros) or "à la carte". Large choice of wines. By taking a meal, you get a special starter which changes every week.
I've tried every single courses and i've never been disappointed.
To me, le barreme is the best restaurant in Arles at the moment.