re: Planning a trip to Europe(Barcelona and Amsterdam)

Went to Barcelona last July and stayed one or two nights before heading to Paris by train. I don't think you need more than 2 to 3 days in Barcelona. I definitely recommend Paris. We stayed two nights and that wasn't long enough to hit the major sites. We stayed in a hotel two blocks away from the Eiffel Tower. We were able to walk to the major sites from there.