Looking for room in north/central London <£850pcm

I am a student (f22) looking for a single or (preferably) double room and have a budget of £850pcm. I'd rather live with others not too far in age but I don't mind a mixed flat - I have been living in a mixed house of various postgrads prior to this. I'm in my final year of university and also work for a charity a few times a month as well as a casual retail job. I'm tidy and easy-going, and have plenty of experience being a good flatmate in a shared living situation. I like having my own space, but I would love a sociable and friendly environment, and would love to live with people I can get to know!