Can't comment on the others but Stapleford are highly recommended.
I completed MEP, CPL MEIR there recently, in minimum hours, on budget, with first time passes thanks to the excellent instruction and support. Took 3 months from start to finish (almost to the day). On the budget front, my net spend at the end of everything was within £200 of the quotation I received. Can't really argue with that - nothing was hidden or misleading. Also the commercial team are fully dedicated to getting everything sorted for you and are top notch.
On site accommodation is perfectly reasonable, nothing special, but lets face it you're there to fly!