Llwyn Onn Guest House is a 200 year old farmhouse converted and modernised to a 4 star hotel standard in an idyllic setting overlooking the Llwyn Onn Reservoir in the heart of the Brecon Beacons National Park. Llwyn Onn is situated on the outskirts of Merthyr with access to major towns with Cardiff to the South, Swansea to the West and Brecon to the North. All rooms are en-suite with Satellite TV and hospitality tray, the majority of rooms also having fridges. A traditional Welsh Breakfast is served in our dining room. We also offer our guests the use of a communal lounge, offering a peaceful retreat at the end of the day. When staying at Llwyn Onn, using the leisure facilities, including an indoor swimming pool and health spa at the nearby JJB Sports complex is free of charge. NO ARRIVALS AFTER 9PM Llwyn Onn Guest House is in an idyllic setting overlooking the Llwyn Onn Reservoir in the heart of the Brecon Beacons National Park. Rooms have lake, garden or woodland views.