Hi Karen, we stayed in the Travelodge at Gatwick a couple of years ago. It's very basic, but the room was clean and it was really cheap.
It was late October when we stayed there, and the room was quite cold, but apart from that, it was fine (a great view of the runway, to build up your excitement for your holiday!
By the way, the room was sound-proofed so didn't hear a single plane all night!!)
Hope you find something!