Property Location When you stay at Old Castle Farm Guest House in Brecon Brecon Beacons National Park, you'll be within the region of Brecon Beacons National Park.Rooms Conveniences include coffee/tea makers, and both irons/ironing boards and cribs/infant beds are available on request.Rec, Spa, Premium Amenities Take in the views from a garden and make use of amenities such as complimentary wireless Internet access and tour/ticket assistance.