Hello ekim,
I will also be attending UCL next fall for the Issues in Modern Culture program. If you move your cursor over the white words "Accommodation Applications" in the red box at the top, you will be able to click and it will direct you to the application. Since I am a terrible cook, I decided to apply for catered accommodation to the two UCL residence halls and to a couple of the intercollegiate halls. I haven't looked into private accommodation, though I imagine it would be somewhat cheaper.