We stayed here for a night while hiking the Hadrian's Wall trail. Burnhead is in a great location -- it's located on the west side of the crags that define the central section of the trail; it's right off the trail itself; and it's about a ten minute walk away from a nice little pub that serves great food and keeps a couple of Real Ales.
David and Christine are excellent hosts -- extremely friendly and helpful. They also make a very good breakfast in the morning.
I believe that both of their rooms contain twin beds, and this is really the only thing that kept Burnhead from being an absolutely perfect place to stay.