I stayed with Graham and Grace for a month whilst working at the NPL. You couldn't meet a more welcoming, friendly pair and I had a great time during my stay.
The room was clean, comfy and tidy and had everything I needed for my stay.
I'd happily recommend Graham and Grace if you're looking for somewhere to stay in the area, and they will be the first people I call if I find myself in the area again in the future.