You can look ahead now for accommodation costs. Some are flat rate like Durham with adjustments for sharing or en-suite. Other unis have massive variety of costs so my child's uni range is from £123 per week for first year halls of residence up to £250 pwk. My child was in an en-suite room at £207pwk for 40 weeks.
What they then spend their money on varies by wants, needs and course equipment. Ds1 didn't need any course materials, Ds2 is in his second year and needed a £57 textbook so far.
Laundry is about £5.50 for a wash and tumble dry for one load. They probably need 2 loads to include bedding and bathroom towels. Food varies massively, Ds2 spends £38-£40 a week at the supermarket (he has a spreadsheet) he does eat salmon, chicken, sausages which will push the price up.
No travel costs as it is too far to come home for a weekend. Then there are things like phone contract, we pay £10 a month sim only deal. Amazon Prime, Netflix, Spotify, gym membership, takeaways, socialising etc.
It is best to look at this now, talk to your Ds about it and see what his expectations are. I think it is something like 60% of students work. Ds1 could not have worked due to his timetable but Ds2 has far less contact hours.
Lots of children work over the summers before uni and save hard. At the end of the day you can only afford what you can afford. He only qualifies for the minimum loan so talk to him about that and then show him accommodation costs.
As for needing to be in a city no he doesn't, he can look for summer internships in his home town which is exactly what Ds1 did so he could live here and not have to pay rent and food over the summer and he now has a graduate job still in our hometown.
Your partner is wrong that the loan will cover him, it is about £4.8k and the £123 per week accommodation is just above that. Then they need to eat food and do laundry as the bare minimum.