No worries you don’t HAVE to sleep in the forest (but you can)
The house is nice and easily can host up to 15 people for sleeping. There are matraces and duvets for most of the beds, but bringing along a sleeping bag is great.
Generally the infrastructure in RandeLab is simple but cozy, the upper floor has many beds, a small library and a Commodore 64 gaming corner.
For those of you who want to do some camping with tents outside, be aware that the ground is a bit tilted.