Any Ideas for Sunday Lunch in Nice?

[wiselindag]

My sister and brother in law will be in Nice in a few weeks and I planned to send them to Acchiardo for lunch until I realized that they will be there on Sunday. Where could they have a lovely lunch with good wine on a Sunday? I'm thinking it would have to be a hotel dining room, but if so which one would you recommend? Any help you can provide would be much appreciated!