Llwyn Onn Guest House is in an idyllic setting overlooking the Llwyn Onn reservoir in the heart of the Brecon Beacons. Recently awarded with AA and Welsh Tourist Board 4 Stars, complete with 11 en-suite bedrooms. Llwyn Onn Guest House aims to provide a warm and friendly atmosphere for guests. Nestled in the heart of the Brecon Beacons, Llwyn Onn is the perfect location for both business and leisure stays, with picturesque views and scenic walks to help you escape city life and experience the great outdoors. Come and see for yourself..