We are a family of 6. DH, myself, 3 teens, 1 baby.
We did POR one year in June. (baby was in pac n' play as she was 11mnths old). 2 teens in one bed, DH & I in other bed & 1 teen in trundle. It was very difficult.
The next year, (making baby actually 13 months old) we got 2 rooms at ASMu. We found this to be much easier! I understand my circumstances were much different with an extra person & 3 teens. We found the extra space & bathroom a God send. So much so we are doing it again next month. I will say this however, the pool & grounds at POR were much more relaxing!
Another option if you don't want to stay off site but like the idea of a "home" is to rent dvc points. More info is available on the dis board if you scroll to the end of the list of forums.
Good luck & have a wonderful vacation.