for/of

You can use either.

for/of
My gut feeling is that "for" is a little more common.

Maybe it's different in British English, but you could say any of these things and still be correct

The rent of my room is £150 per week

The rent on my room is £150 per week

The rent for my room is £150 per week

I pay £150 rent for my room each week

I pay £150 rent on my room each week

My room's rent is £150 per week