unsure on what the rent is, as its now a year since i was in halls.
you have to get a permit for the car parking, you'll be given a form with your accomidation forms during the summer sometime, so its nothing to worry about.
the biggest positive is its only across the car park from the main campus buildings, so its takes about 2-3mins to get to lecture! also all the rooms are only 6years old and are en-suite.
cant think of any major drawbacks, though it could do with better social facilities (the current ones are porta-kabins), though i believe they are going to build some sort of common room in the future.