Just to say now, if you want in to Windsor Terrace, Central Link (or even Richardson Road, Marris House) you need to do it realllllllly early! (I'm a first year student)
Last choices tend to be Henderson Hall and St Marys. Which are both dead on, and everyone loves them when they get there (I'm in St Mary's, was gutted when I found out but now I'd choose it again because it's so cheap, less walking to do and amazing standard accommodation) but they're the ones people don't want to choose after looking at the map.