There is a huge amount to be said for living nearby, particularly in your first year - it makes going to social events so much easier, you can just pop down to the library to get a book, and you can experience a bit of independence which I think is quite important. And you won't be at the mercy of delayed trains or coaches so you'll never worry about missing a lecture or getting stuck in Kent overnight.
Do you have the option of going to a London Uni, because that might be better if you're not keen on living in student halls and aren't dead set on Kent? But if you really like the course at Kent, and really hate the accommodation, then commuting is clearly the best option. It's certainly feasible, but comes with its own set of problems.