We have a friend that owns one and used to go every year at this time, all though not been for a couple of years.
They are in a great location for CYB biking and all other things in North Wales.
Thoroughly recommended, although the on site pub / restaurant is very expensive for food and tbh not that good.
Different cabins have different beds and facilities so make sure you like the one you choose.
Riding from the site is also great. You can go up over the top of the site on the road, keep going and turn right onto a gated farm track that goes to the right of a small church. From there it is a great ride over the tops and down into CYB. It will eventually bring you onto the trails but you have to follow your nose a bit once there.
We normally spend a week there with a mixture between riding and travelling around. I’ve gone to Nant Y Arian from there too but it is a bit of a drive.