I did most of my exams there last year, as others have said there is an excellent Premier Inn just across the road and that is where I stayed.
You just walk into the main Learndirect building, let the guy at the reception know you are there for CAA exams and he'll send you up to the exam centre.
For someone like myself without a car, it was miles easier than taking the exams at Gatwick (as I did with my first module). Shops/restaurants, station and exam centre all within a few minutes of the hotel.
As above, make sure you take only the calculators listed as approved. I would also take more than one in case one of them dies on you in the exam, as I don't think the invigilators are allowed to hand out spares (even if they have them).
Best of luck!