Well, not exactly the first Westin in Paris .... many of us "old timers" will well recall the several Westin Demeure (sp?) Hotels that were in Paris -- to include the fabulous Baltimore hotel. Yes, these hotels were dually branded (like Westin did with some Caesar Park hotels, ANA, Prince Hawaii/YYZ, etc, etc, over the years).
So, to suggest that this is Westin's first foray into Paris is not precisely so. My old Westin Premier account benefitted greatly from my stays in these former Westins!