An important choice of accomodations is present in Ile-de-France. Here are the main sites that will allow you to prepare your stay :

Paris view

Crédit Photo : Parisinfo.com

http://www.nouveau-paris-ile-de-france.fr/
http://www.parisinfo.com/
http://www.tourisme-hautsdeseine.com/
http://www.tourisme.yvelines.fr/
http://www.versailles-tourisme.com/