Hi Claire,
Thank you so much for visiting the Disney Parks Moms Panel with your question.
Disney's Port Orleans - French Quarter is a lovely resort. The grounds are so lush and beautiful.
Typically, if you are making a request such as a particular location, I would recommend that you call the resort within 10 days of your check-in date. However, since you are actually looking for an upgrade in the room for which you are willing to pay, I think that it would be a good idea to call Walt Disney World directly if your travel agent cannot do this for you. I just checked online, and I was able to find availability for a King Bed room at Disney's Port Orleans - French Quarter for the dates of your travel. I suggest that you ask your tour operator for all of the information on your trip that they can give you, and then call 0800 16 90 730 to speak with a Disney cast member. I am not sure if they will be able to help you since your trip was booked through another tour operator, but I think that this is the best place to start at this time.
I hope that this information is helpful, Claire. Have a wonderful time planning your vacation, and please do not hesitate to ask if you have any further questions.