I own 12 weeks and don't always use them all. This has been my second year renting with Starwood. I rented with them for that exact reason... I didn't want the hassle.
Well... welcome to Hassleville. OMG!

Last year I had President's week. They screwed it up never actually rented my units... No, it's not that nobody rented.
They never put them on the market! Apparently, they "forgot".
Now it's one thing if I put them on the market and they simply didn't rent. But to somehow lose my paperwork, so they don't even know my units are for rent is ridiculous. I complained they covered the MF. That's fine. I just didn't want the weeks to be a total waste.
Apparently I'm a masochist, because I reserved two weeks for July 4th and gave it to Starwood to rent again. This time I reminded/checked with them on the first of every month (starting 6 months out) that the units were on the books as rentals.
The week before the holiday week I checked with WKORV itself. All was good. They said they were 100% booked. I checked with Orlando one last time. All was good. My units were DEFINITELY in the rental pool. No doubt about it! During the holiday week itself, I checked spg.com every day to see if any units were available... even for a single day. Nope... 100% booked. No availability.
Lastly I even called every day to the front desk. No vacancies. Not even for a single day. Nothing. Nada. Nichts.
So... a month and a half later I am told only three days booked on a 1BR unit. I think it was four days on the studio. The other 1BR and studio (they recommend you reserve them as split units if you want to rent.) didn't rent at all.
My recommendation: Run, don't walk, from Starwood as a rental agent. They have their heads where the Sun don't shine.
Don't get me wrong. I love the heck out of the SVN and I'm extremely happy I'm an owner there, but like everything, they have warts. Their rental system is one of the warts.