Look here https://students.case.edu/housing/facilities/tour/
Freshmen live in the North Residential village (not the apartments)…CLick on one of the dorms and then click on a floor and you can see the layout. The smaller rooms will be singles…there are not that many.
For a typical freshperson, they will be able to handle sharing a bathroom and a roommate. It is all part of starting to become independent. If your student has a legitimate medical/psychological need for a single, probably woould be good to contact Housing office and have your student talk to them.