Hey Ellie I’m actually one of your fellow students at Bristol in first year!
Cats can get stressed but they do surprising well in catteries as long as they have home comforts but you could also consider a sitter to come in and feed them when you are gone!
It may also depend on the cat itself, some cats will be naturally more nervous and seeing as you are interested in shelter I assume you will be rescuing one so considering their background could be a big thing!
I would defo look into cat sitters rather than catteries especially to minimise the stress if you can xx