I am a Priceline Fan...
I personally go to Disney a couple times a year, and stay both on and off property.
With EE no longer in existance, and since I always rent a car, I see no reason to stay on Disney Property. IMO the Themeing of the resorts really does not mean a bunch to me compaired to the deals I have gotten off Prieline.
First, I can not stress enough... RESEARCH before you bid. You do not want to OVER BID...
(which in my opinon the person who spent $40 for a 3* did... I am staying at the same hotel in 3 weeks for $28 a night, and 3* seem to go for under $35 a night......)
I have stayed in two out of the 3 Resort level hotels.
Your question is are they big enough for 2 adults and 3 kids..... Well that depends.
With your origional ressie, is that room big enough? The hotel rooms I stayed in were pretty big.
I stayed in the Wyndam Palace, located in Downtown Disney. Getting an Epcot view, allows you to see over Epcot, and we could see both Epcot's and MK fireworks every night. They were absolutely woderful. Our room had 2 queen beds, VERY LARGE Bathroom, table, chair, desk and chair, and all rooms have a balcony, with 2 chairs, and a small table. Our family fit just fine, it included 2 adults, 2 kids sharing one bed, and fitting in a porta crib for an infant. We were not crowded. It is probably my favorite offsite hotel at this point.
I also stayed at the Marriott World. This is a beautiful hotel, with several swimming pools including an indoor one, which at the time of year you are going is just fine. I stayed 5 days, with 2 adults, (my sister and myself) and 2 infants. The room we had was pretty typical for a hotel room. There would of been room for a fold out bed. We had a love seat, and comfie chair along with a desk and 2 full size beds. The bathroom was typical hotel style, sink outside of the potty/shower area. It is located just outside of the Disney area, and took less than 2 minutes to travel across the bridge, and onto Disney property. It is a breathtaking hotel, and HUGE. We asked and recieved fireworks view, it was in a newer wing, and a LONG walk from the lobby, overlooking a parking lot, but we could see all of the fireworks from all of the parks. The major downside to this park is Parking. It is a long walk unless you go to the "sneeky back parking lot behind the hotel" which let us into our wing.
I have never stayed in the other Resort level hotel which is the Hilton in the Disney world Village.
With research, and work you can get a great deal on Priceline...
But the downsides are 1 you dont get to pick the hotel you stay in, and 2 most of the hotels charge you a resort fee of typically $10 a day.
If you try priceline, go to the link that was suggested above, they are alot of help. I managed to get all of my great deals with help from them!
laura