I would question staying at the Poly in a studio villa. We just had a stay in a studio villa as a family of 4 and we were a bit cramped. Plus you only have access to one bathroom. I would suggest a studio maybe at Kidani Village if you can rent points from a
DVC member as you'll have 2 bathrooms there. It will make it a bit more manageable. You can also get two rooms at Poly that will work as well or see if you can rent a DVC 2 br villa.