After ten years of visiting this wonderful hotel, the restaurant now has a separate entry; as it deserves. And this comes at a moment when it's all come together. The new chef, Vincent (I checked, he's got both ears!), is young and brilliant. The maitre d'hotel/sommelier is also spectacularly good. Both ooze Gallic charm. (No...not 'ooze'; sounds oily...they're just very nice guys).
The restaurant itself is small, so you'd better book, is designed in the 'shabby-chic' mode of the hotel itself, and much of the cooking is done while you watch. (The prep is tackled it the ultra-modern kitchen through the swinging door, as is all the hilariously-authentic shouting!)
One of the defining moments for me...apart from the inventive and intense tastes...was watching two little kids watching the chef and getting under his feet at his most hectic...he was so nice to them, and neglected to splash them with boiling fat. Which I would have done.
The Mas is about 35 minutes drive from Arles, so if you're dining, and don't have a poor, misbegotten, 'designated driver', book into the hotel for the night. Better still, stay here for the whole trip and visit Arles if you must. It's a grubby little town anyway.