Another factor to consider is whether or not you want to spend 100% of your time down there immersed in ATC. I shared with two non ATCers for the seven months I was at the college and it was nice to have a break from talking about work every now and again. Bournemouth isn't that big a place so you're never going to be far away from the other guys on your course. It was also really nice to feel that you were going back home to your own place.
If you do look to rent, Westbourne is really nice.