A very special birthday present -- 7 or 8 day trips with one boy at a time (they are fraternal twins), or both together, this summer (August). If separate trips, there will be two destinations. I'm thinking of flying from North America to Paris, Barcelona, or Florence. I'm overwhelmed re how to decide which destination, where to stay (priorities: clean, safe, well located, reasonably priced) and what to do at destination. Should we stay in town or are there great side trips? Is the cost of one destination appreciably different from another? The boys are bright, well behaved, love the arts among many other things, and are generally curious. Can you help with trip planning suggestions? Many thanks.