Location - Sanji's cooking station
At one end of the restaurant, centred on the floor, there is a beautiful cooking station manned by Head Chef Sanji. Seating directly at Sanji's station is limited, and since it's assumed that most people will want to sit where they can see the chef cooking, there is a limit of one slave per master in this section of the restaurant.
The head chef himself is dressed in a slick chef's uniform that looks like it's been tailored just for him. He's also wearing a poofy and ridiculous looking chef's hat that he's somehow managing to carry off with dignity (And no small amount of pride), despite the foolishness of the look.
The outer wood on Sanji's station is made of Mountain Ash, with a locking door where the slave can enter and exit as his duties require. (Think the counter at the vet's in Teen Wolf.) He leaves this open, but is able to close it quickly should the need arise.
Some witches may notice that there is a touch of magic to the way Sanji prepares meals. He spent two years training under a witch master chef who taught him how to prepare meals to increase strength and vitality, to heal, and to generally give people a happy buzz. He's no witch by any means, but he does have some secret skills.
Note: Slaves are allowed and encouraged to join their master in dining at this table. No patron will be removed from this location just to provide seating for another patron, regardless of race or stature.