I've been thinking about taking a week long vacation in Europe from May 3. This would be the first trip to Europe. I want to field good pieces of advise from the seasoned Euro travelers on making the best of that limited amount of time, such as recommended cities, arrival/departure airport, and logistics in general. I want to go to Paris/FR, London/UK, Rome-venice/IT, Prague/CZ, & Barcelona/ES for starters. I know it is not practical to visit them all in one week and I need to narrow down the list to about 2 or 3.