If you want a hotel with an air conditioned room and services and insects in your room freak you out, this is not for you. If you want to be away from everything, hike the trail that runs through the woods, avail yourself of the hotel staff's night nature hikes and eat communally served traditional, simple but good Costa Rican fair and don't mind sleeping in what's essentially a permanent tent with a bathroom attached, this is a brilliant place. There are only about 10 huts, so it's a pretty small facility.
The rooms have beds with mosquito nets, a shower and bathroom, and a balcony facing the forest. The only power is in the bathroom, although there is an electric light in both the bathroom and the main room. At night light attracted insects, but during my stay in March I barely needed mosquito repellent around the area otherwise.
Be sure to have a relatively rugged vehicle and know how to get there or use a shuttle or taxi; it's located 3.3 km down a dirt track which will put your vehicle's suspension to test and won't appear on most maps or GPSs. Also note that while it's relatively close to La Fortuna, plan on 40 minutes for the drive, since the roads are curvy mountain roads.
The hotel staff and general manager will eagerly do their best to accommodate requests, be it for reserving activities, transportation, dietary needs etc.