Just butting in...
I've walked around the resort (now known as Harbour Lake) and I'm sure that they have elevators - I not been to a Marriott resort with more than two-story buildings that didn't have them, in fact.
To get more info on this resort I'd suggest going out to
http://timeshares.marriott-vacations.com/ownership/resorts/marriott-harbour-lake/overview.html. Of particular note might be the resort map and the villa layout charts. There are also a couple of slide shows showing resort features and the villa interiors.
You're right that this isn't a typical hotel experience - it's a timeshare resort - so you take care of your own trash (there'll be a trash room near the elevator). You also do your own dishes and have in-unit washer/dryer and they supply you with a small starter supply of laundry detergent and enough dish detergent packets for the week. The kitchen and bathrooms are all quite well stocked for the maximum number of people designated for the unit (I think that two-bedrooms are 8 and one-bedrooms are 4). There are usually extra blankets and there's the bedding for the sofabed in the livingroom (usually located in the storage unit under the television. And you'll have both towels for in-unit use and a corresponding number of pool towels in your villa (you're responsible for them so don't leave them at the pool when you go back to the villa).
Dick Taylor