Housing in London, England for the summer?

There’s this summer internship I want to apply for next year that looks really awesome, though it’s in London. I am an American student so I have no clue how summer housing would look in London. Do local universities house students? Hostels? Would I have to find an apartment?

I also want to add that I will be 20 years old then and the internship would cover housing, food, and transportation payments.

Good luck finding affordable housing in London…