re: Paris/Barcelona/Rome trip in mid-May...I need some recommendations

Paris - Best restaurant city in the world IMO. One of our favorite restaurant rows is Rue St. Dominique near the Eiffel Tower. There are dozens of excellent restaurants within a few blocks of each other. I will name a few: Le Violon de Ingre, La Fontaine de Mars, Le Fables de la Fontaine, Chez L'Ami Jean, and Café Constant. We like Chez George on Rue du Mail. The best and most expensive meal I have ever had was at Guy Savoy. The prices are astronomical at night but they have lunch specials. As for Rome - a good casual restaurant near Piazza Navona is Enotecca Cul du Sac. It is a small wine bar with delicious food and an encyclopedic wine list. Hosteria Costanza just off Campo de Fiore has delicious food in historic surroundings. It is built among the ruins of the old Theatre of Pompey which is where the Roman Senate was meeting when Brutus stabbed Julius Caesar there in 44 B.C. I can give you more in Paris if you tell me what neighborhood you want to be in, but the metro puts the whole city at your doorstep. Have a great trip.