The Grand Hotel, an Intercontinental, is very nice, but pricey. On the I'll St Louis both Hotel Deux Iles, and Lutece are charming townhouses and lovely small hotels on the beautiful island in the Seine.( mid price range for Paris) As for good food, ,I love Table D'Anvers for lunch especially. Expensive, but less so for lunch and despite its seedy location, great food and good service. Also Arpege-- very expensive, but less at lunch.
------------------