Hi everyone,
Today, I had my interview at the Portland's field office. The interview was scheduled for 12:30. I checked in one hour earlier. The officer called my name around 12:45. The officer was a nice (but very serious) lady. My interview experience was very straight forward. She just asked for my passport and driving license. She removed the I-94 form and told me that I don't need that anymore. She went through the questions on I485. At last, she said that she will approve my case and I should receive my GC soon by mail. She didn't ask for any other documents.
Overall, it took about 15 minutes.
I will be still hanging out in the forum to help others. I wish you the best of luck.