Don't know about the campsite, but the pub itself is amazing! Great range of real ales, really friendly regulars and a fantastic atmosphere.
And when friends of mine were late coming down from Elidir Fawr to meet me there, the landlord and landlady let me stay on - after hours - and wait for them. They even turned the lights outside the pub back on again to give them a beacon to aim for. You wouldn't get that in many places.
Amazing people, amazing place!