After several inquiries, tons of research (as you can see here, Paris Apartments), we've contacted and contracted for this apartment: Luxurious Air Conditioned Flat -Center Paris - Centre Pompidou. I've had several pleasant e-mail interchanges with the owner, have gotten feedback from previous renters and received approval from Sammi (hope Jake agrees). A little nervous that the a/c is only in the living room, but there are fans in the bedrooms so I think it will be all right. It's a new location for me, but on a public square and high enough up that I'm hopeful for minimal traffic noise. Plus, it's the least expensive apartment we've looked at by about €400.
Now, to start organizing activities, research restaurants and book the airfare!