OK I'm glad you pointed those 2 facts out to me. I assumes it was west of western Europe. North of W Euro is cold, as far as I know. I dint know much European geography, but I won't be drawing the mainland or anything, so it doesn't matter.
I keep forgetting it's just a school, for Arcanists. There would also be a regular school, and small university, in the city, right?
And I'm thinking now, the main building should be quite a lot bigger than the dorms. I'm thinking around 6-8 times the size of one dorm building.
I'll put together an outline sketch, then we can talk more on style and materials etc.
If you don't reply before I upload, I'll just update this post.
eta 3-5 hours.