I had a question about this, too. We will be at WDW for a total of 4 days on this quick b-day trip in Aug. We should arrive at POP at around 2PM to check in and then we'll be checking out about 8AM on day 4. Would they charge us for the four days or could I ask them about charging us for three because essentially we would be done using it and clean it out on our thrid night and have no use for it after that. Thanks!
Oh, and when you rent one from the resort, do they place it in your room upon check-in? We'd make a grocery stop for milk and sandwich fixings prior to checking in.