Me and my girlfriend stayed at the Cart House this previous weekend.
It's an amazingly well kept cottage, with all the modern luxuries you could possibly need. A fantastic kitchen with all modern furnishings you could ever need, a huge sofa and log burning fire, and a brilliant bedroom and en suite.
The owners were really welcoming and fantastically helpful, the cottage was spotless when we arrived, and we were provided with a lovely welcome basket as well.
While its out of the way in a peaceful area, it's only a 20 minute drive to Brecon and there's plenty to do. We managed a brilliant hike straight from the door of the surrounding area.
We couldn't have had a better time!