The second floor! Have you looked at Tikiman's site? It is a wealth of Poly info! Google tikiman Polynesian.
Did you book a garden view room or a lagoon view? The reason I ask is that that room (2021) was a lagoon view room that we were upgraded to, we paid for a garden view room!
Also the Tahiti building is the farthest building from the Great Ceremonial House. It was a very good location for us though because that means it is the closest building to the TTC so it was the easiest to get to the direct Epcot monorail, instead of getting on the monorail at the Ceremonial House and then transferring to the Epcot monorial at the TTC. It was a timesaver.
PS: If you like that, wait til you see the fireworks photos from that view!!!