For summer with the family, we've used self catering chalets we find on the Morzine website. Typically we've split the chalet between 2 families. Prices are reasonable if you source from France direct rather than go through Brit intermediaries, but n.b. this is for a general family holiday, not biking. I'd defo use guides if biking to make the most of the place.
We tend to fly, take a flight from Friday to Friday which is much cheaper, stay the 1st night in a logis de france place on Lac Montriond, and leave the chalet a day earlier – saves a lot of money.
The chalets are generally good spec. But pay for them to be cleaned when you finish, this is normally an optional extra. These Europeans have v high standards and expect it to be in prestine shiny condition when you finish, not something to scrimp on.
There is tons of stuff to do. If you just hang out in Morzine there is an insane version of Go Ape, horse riding, the swimming pool complex is fantastic and free for kids under 6, the Pleney lift has a luge run under it, etc etc. Each resort has something nice to do, and they're not far apart.