Just to add OP we chose Lancaster as DS is quite shy/introverted.
We were worried about today but he was fine.
The accommodation is fab.
In his college they have buildings that contain 8 flats - 2 per floor.
Each house 8 students - all en-suite rooms (great for a child who values privacy) with a shared (large) kitchen/diner.
As a start it was great because he just had to meet his flat mates and everyone was super friendly.
So it's quite "small" as you have flat, building, college, university which makes it far less overwhelming.
Everything was super organised today and everyone incredibly welcoming and friendly.
In his college the bar and common room is fabulous, plus his has in college dining with a big dining hall and you can book out dedicated music rooms with pianos/drums etc etc.