Hello, Jessica! Thank you for “warming” up to the Disney Parks Moms Panel to ask about your vacation. I’m “simmering” with ingredients to make your magical vacation more delicious!
An in-room Microwave is listed as a Room Attribute for guests staying at
Disney's Yacht Club Resort, so as long as you have entered a request, I do not see that there would be an extra charge for it. A Cast Member on the reservations end will try to make sure that you get into a room with a microwave. Of course, as with any room request, it is not guaranteed, but Cast Members will do what they can to make sure the request is met.
There is a microwave in the
Beach Club Marketplace as well, which may be a step from Yacht Club, but you are welcome to warm items bought from the quick service counter as well as items brought from home. I hope your vacation doesn’t leave you hungry, but leads you back for a second helping of magic! ~ Lindsey P.