Rudi: Sorry, I have never been to the auberge de l'Ill.
I have been to the Waterside on a number of occassions, but it is a couple of hours drive from where I live, so it means staying overnight. The accomodation is good but at £130 ($210) and say £200 ($330) for an average meal for two, if the company isn't paying, I'm not going!
However I am very fond of 'Chez Nico at Ninety Park Lane' (Grosvenor Hotel) and should Simone and I make another wedding anniversary, I will do my best to take her there! Consider it highly recommended.
Nick