I've just stayed in this same chalet complex, with Crystal Ski, and without children. However just wanted to add a similar comment on the standard of the accommodation. It's AWFUL.
These were built in about 1988/89 for the Winter Olympics and it looks like they haven't been updated since. The kitchenette, used by a under-trained chalet host to cook for 12 people, was tiny and badly designed. Meal times were therefore disorganised to catastrophic.
The bedrooms (in "Chalet Mariette", which is a floor of Arolles building) were not individually lockable, even with a thumb turn lock. The front door of the chalet has a lock but unless you're the last out how do you know your fellow residents have locked it? There is no other lockable space in the building - your camera, laptop, passports are basically available to anyone who wants to wander around the resort and try some doors.
The ski lockers were not very warm, meaning my boots has condensation inside in the mornings. On the other hand, bedrooms (underfloor heated) were stuffy and hot at night and the only way to regulate the temperature is to have the balcony door slightly open.
I would by no means bring children to this complex. The Crystal ski company's service is a whole other (bad) review.