Hi there, Laura!
Because
Disney's Port Orleans Riverside offers four bus stops, no room is more than four minutes' walk from a stop. You should be fine in any of the buildings.
The following information comes from www.portorleans.org, a fan site dedicated to all things Port Orleans:
The main (South Depot) bus stop at Disney's Port Orleans Riverside is located to the right as you exit the main building, just outside the rear exit of Fulton’s General Store.
The first station (Blue Bayou Platform) is the stopping point for buses to Animal Kingdom, Epcot and Downtown Disney while the second station (River Delta Platform) handles the buses destined for the Magic Kingdom and Disney Hollywood Studios. Note: the daytime Downtown Disney buses stop at Typhoon Lagoon en route, while the Animal Kingdom buses also serve Blizzard Beach.
There are three further bus stops located around the Sassagoula Circle perimeter road:
The first is the West Depot, serving Alligator Bayou Lodges 24-26 and 28-35.
The second stop is the North Depot, serving Alligator Bayou Lodges 36-39 and also Acadian House.
The final stop is the East Depot, which is located behind Magnolia Terrace and also serves the garden-facing rooms of Oak Manor.
Have a wonderful time!
See you later, celebrator,
-Deborah B.