Coming to the IAP:
To help you in your search we have an agreement for a discount CEA rate with some Hotels by using codename
“CEA” or “Conference in Astrophysics”.
2 hotels in downtown Paris, near Place Denfert-Rochereau, and an easy access to RER B line:
Hotel du Midi : http://www.midi-hotel-paris.com/
Hotel du Lion : http://www.paris-hotel-lion.com/fr/