Hi Kristen,
I think the perfect arrangement for your party of six (or eight) would be a two bedroom villa at either
Disney's Beach Club Villas or
Disney's Boardwalk Villas. These accommodations have three rooms with beds (one with a king-size bed, one with two queen-size beds or a queen and a full-size sofa bed, and a room in between with a queen-size sofa bed). These villas also offer two full bathrooms, plenty of closet space, a full kitchen, and private laundry facilities. I fell in love with the two-bedroom villas at Disney's Beach Club Villas when I stayed there last March. Trust me. You won't want to leave.
The added bonus to staying at these properties is that your teens can walk or take a quick boat ride to the two Disney theme parks with the most thrill rides, Epcot and Disney's Hollywood Studios. They really are perfectly located for groups traveling with teens who will be navigating the Disney theme parks on their own from time to time.
You could also look at the price on two adjacent, standard rooms at these same resorts. Depending on whether promotions are available at the time you book, this might be a less expensive way to accommodate your traveling party at Disney's Beach Club Resort or Disney's Boardwalk Inn.
Have fun planning your magical December vacation!
Jill