Hi there!
Student finance will pay your tuition fee, which covers your course, to your university. Your maintenance loan covers living costs and will be paid directly to your bank. It gets divided into three and paid to you in three instalments spread through the academic year (usually around September, January, and April). It's up to you to pay your rent, every university will have a different system but usually, this is in 3 instalments across the year, just after each maintenance loan payment. If you go for private accommodation, it might be monthly.
Most university-owned student accommodation will include bills, which also differs from university to university. The website/page for each accommodation will likely have this information. The £250 you've seen advertised, assuming you're looking at student accommodation, will likely be per person per week.
Usually after the first year, people tend to look for private landlords to rent from. Your university will likely have companies/landlords it recommends. It might also be an option to stay in halls after your first year, if that's what you want, and if your university offers this. Not all universities offer accommodation after the first year.
To give you an idea - I get close to the maximum maintenance loan. That covers my rent and bills, but I work to get money for food etc. There's a student finance calculator you can use on the Gov UK website
(link here) to look at how much you might get per year from SFE, then if you divide this by 52 you can use that as a rough estimate of how much you'll have each week.
Hope this helps🤗
-Kiera (Student Ambassador, York St. John University)