You can find a large choice of hotels with a wide range of prices on different official web sites for visitors, such as:
Hotels in the Orsay area:
• Hôtel Résidhome, Bures sur Yvette 70 € per night, breakfast 10.50 €.
This is the closest hotel, located at 12 min walk from the workshop location.
The closest train station by foot is ’Bures sur Yvette’. A bus shuttle exists also from the hotel to the RER B train station ’Le Guichet’ (ask the hotel). Fully-furnished kitchen in the room. Rooms up to four people.
Hôtel d'Orsay ( https://www.orsay-hotel.com/ ) - 74 € per night for one person, breakfast 9 €.
Located close to RER B station ’Le Guichet’, at 20 min walk from the workshop location.
• B&B hôtel Saclay, Plateau du Moulon, Saclay approx. 70 € per night for one person.
Located at 5 min by bus to RER B station ’Le Guichet’. At 5 min bus + 10 min train + 15 min walk from the workshop location. Really best to use a car (10 min)
In the vicinity of the Orsay-Saclay campus:
In Paris downtown: