Thanks guys. Because the Olympics are coming up (and of course, higher hostel costs), I eventually found a room within 5 minutes walk from Fulham Broadway for £100 a week. Somewhat expensive, but cheaper than hostels and more privacy. I found the place two days ago, and moved in yesterday morning. There's no contract but has a 4-week deposit which I will only get back if I notify them 4 weeks in advance when moving out. Due to some good luck (or bad luck, depending on how you look at it), I am about to get a job (I just have to sign the contract), but my first project might be in the Leeds area. Depending on how keen they are to send me there, I might not see my £400 deposit back.