A CM last summer told me that Samoa was the most requested building at the Polynesian. We had been assigned there but had only requested non smoking, first floor. We used to be in that longhouse quite often when our children were younger so it was fun to be back in it although it was just my DH, one son and me. It does have a great location.
However I truly think that ALL longhouses at the Polynesian have their own advantages so don't be disappointed if you don't get Samoa...find the magic where you land.
Also Samoa is not nearly as large as Tokelau.
Really, wherever you are at the Polynesian, your experience should be magical.
And welcome to the DIS!!