20 yr/old Aussie - looking for a few months accom.

I am moving to London in mid November and require a clean, fairly priced and convenient place to stay for a few months or more with people around my age group. I have just finished uni in Australia and intend on doing a bit of travelling and work during my time in England, meaning i may be away for extended periods of time. I am very clean and organized, but don't like cleaning up other people's stuff! I don't really know anyone in London, at least initially, so having people to go to a bar or club with on the weekend would be great.