Looking for a cheap room to rent/share in London!

Hi,
I’ve just graduated last month and moved to London. I work in education and will be travelling a lot, just need a super cheap place to crash a few days of the week.
Anywhere with a decent connection to London is fine. I’m super clean and tidy, cleaning is pretty therapeutic for me. I love tennis, gym, travelling and music. I’m a lively person, and love to make friends, but also will never host a party!

My budget is pretty low so I’m looking for someone to share a double room with. I won’t be there on weekends, and only 2-3 nights on the weekdays.