I'll be headed to Paris for a week in September to celebrate an anniversary. We originally booked the Marriott C-E, but reading through this thread (and other reviews), I switched to the Ren Trocadero for a more romantic, boutique-y feel.

The Ren Vendome and Rive Gauche aren't available for my dates, which made it a little easier to decide.

Very excited for the trip, and thanks to all who have posted such great information.