seafox

what about a rental from Hertz and do thedrop off at Carousel du Louvre parking garage and then a short taxi ride to teh apartment (I'd walk it, but not with a bunch of children and bags)

ParisAmsterdam

Pull up to apartment, unload passengers and luggage, drive to most convenient drop location.

As has been mentioned, if you have been driving in Marseille, the Rivera and who knows where in Italy, dropping a car in central Paris will be no big deal.

StCirq

A rental from Hertz these days, as I understand it, involves a drop-off charge even within France. Don't know for sure, as I never rent directly from Hertz.

Francewithfive

OK, you are convincing us to drive to the apartment, drop bags and then return the car. We should be experts after 4 weeks in Europe (fingers crossed).
Thanks everyone. So appreciative of your words of wisdom.