There is no hostel service on the university campus.
There are not many hotels close to the location of the hotel and hotels are pretty busy at these dates.
The closest hotel with available rooms (as of the 14th of May): https://www.residhome.com/residence-hoteliere-aparthotel-buressuryvette-183.html
Other possibilities consist in looking at hotels on the RER B line (at Massy-Palaiseau station for instance, there are few possibilities) or in Paris (typically close to Denfert-Rochereau, or Luxembourg stations).
