Hotels in Orsay area:
Hôtel Résidhome Bures sur Yvette (~100-120€/night), is closest, located at 12-15 min walk from the workshop location. It is in the proximity of RER B station "Bures sur Yvette". A hotel shuttle may be used to the RER B station "Le Guichet".
Hôtel d'Orsay Orsay (~80-120€/night), located at 15-20 min walk from the workshop location. It is in the proximity to RER B station "Le Guichet".
Hôtel B&B Plateau du Moulon, Saclay (~75-85€/night), located at 4-5 min by bus to RER B station "Le Guichet", followed by 4-5 min train to station "Orsay-Ville" or 15-20 min walk to the workshop location, or 10-12 min by car/taxi.
In the vicinity of the Orsay-Saclay campus:
https://www.destination-paris-saclay.com/en/
In Paris downtown:
https://en.parisinfo.com/where-to-sleep-in-paris
Intenrational houses with single/shared rooms (<80€/night) may be booked for students:
https://www.fiap.paris/english
https://www.hotel-cis-paris-kellermann.com/en
https://www.hotel-cis-paris-ravel.com/en