We usually stay in a studio with the 4 of us - dh, ds(8), dd (6) and myself and we feel that we spend so much time in the parks - why waste our points on the room that we just sleep in? We do pick up cereal and milk for breakfast and a couple of snacks - but otherwise this suits us just fine. If we do come back from the parks early we hit the hot tub and then out for dinner or exploring.
If you aren't going to be doing the parks, I would suggest a larger accomodation.