Bryn Bettws cabins can work out cheap and you can sleep five in one, but since I've been staying there on visits (the last two years) we've had constant problems with the heaters not working…the last time in November none of the three heaters in the cabin worked, and as usual we had to try and dry out riding gear and heat the place with one replacement electric heater. Every time I'm there I mention it, and every time we get one replacement heater. The owner has refurbished the old outdoor activity centre on the site for accomodation so that may be a better option.
And before someone chirps up, the reason we have gone back repeatedly after heating problems is that it's cheap.
PS. Bring some bog roll and don't expect any washing up liquid.