When I checked into the Poly last summer I had requested the Tahiti longhouse with an MK view when I made the reservations the year before. I chose that one because I liked the location close to the TTC and the view of the lagoon. When we arrived we got an upgrade to concierge at the Hawaii longhouse. We really didn't want it, believe it or not, we wanted to stay at the Tahiti. They couldn't honor our request because everything was filled up they said. I don't have much experience with the Poly so I don't know how much luck you'd have getting a specific longhouse that you want. I think if they can they will, but they won't stretch or go out of their way to give it to you. Just my experience, of course.