The important bit in my post was the variation - Rai's post (the one I was responding to, as I clearly cannot comment on St Ant's), said 'but from what I've heard, all accommodation at Oxford is rather good, especially for Graduate students.'
...I feel that is a fairly untrue, very sweeping generalisation, particularly if comparing to other universities. I have heard a lot of grads who have the choice say that they much prefer to not live in College accommodation due to being able to get somewhere much nicer for less money (and in some cases, actually be closer to their College). A lot of people lurk on here without posting, and may have taken Rai's statement as true.