Oxford was three of the best and worst three years of my life. While it is fantastic to have the level of attention you get from tutors (I also had a great personal tutor!), it is a breeding ground for stress and exasperation of mental health issues. I would only advice someone to go there if they truly adored their subject – two essays a week is too much if you are not interested.
I had a good time because I made great friends, and enjoyed the work (just) enough. But I wouldn’t go there if I had my time again.
Rent is ludicrous – if you go, make sure you do something about this!