Hello, I’m a current Durham student at a hill college. Unfortunately, you wouldn’t really be able to use the library or amenities such as that as they are mostly reserved for castle students. However, you can absolutely visit the college bar and toastie shop whilst there. I know the idea of living in a castle is very cool, but even if you end up at one of the more modern colleges like I have you will absolutely still come to love it, and you can always take some nice walks near the Bailey and down on the riverside by the boat club to get some really nice views of the cathedral and castle! Plus if you end up on the hill like I have you can get the chance to watch the sunset over Durham on Observatory Hill, which is absolutely beautiful 🫶