IF you itemize your taxes, then:
1. The property taxes are deductible.
2. The interest paid might* be deductible but only if it is secured by the property itself. When financing through Disney, the loan is secured by the property.
The amount of interest you'd pay on that loan would depend on the interest rate you get and the length of the loan. The interest on $15,000 at 10.75% for 10 years would be approximately $1,560 for the 1st 12 months. that's approximately $130/month in interest and about $75/month toward principal.
You can experiment yourself at this site:
http://ray.met.fsu.edu/~bret/amortize.html
*There is a limit on how many properties you can own which have mortgages and which you can deduct interest payments. At one time it was 3 but you'd need to verify that. Properties that use to qualify would be a home mortgage, home equity, 2nd mortgage, other real estate such as a summer home, lot, etc., or even an RV or boat (if it has full cooking, sleeping, bath accommodations).
As always, a disclaimer: The above is my recollection and may not be current IRS regulations.