This is how the interview went:
1. Arrive at the US consulate (it is on Martin Place, in the MLC building) at 9h45 as my interview was scheduled for 10h00.
2. Take elevator to level 10 where one has to go through the security screening.
3. You have to present your appointment letter & passport upon arrival.
4. After that you go through a metal detector like they have at the airport. I had a lighter with me, which I had to hand in. Any electronic stuff like mobiles, bags, etc also has to be handed in at the security screening.
5. Then you are escorted to level 59 where the processing happens.
6. Take a number and wait.
7. Waited about 20 minutes till they called my number. Went to the counter where they take all your documents and check whether all the required docs are there. Fortunately I had all the ones on the 2NL so that was easy. Other people who were there became engaged in long-winded debates about why they could not have the required documents... blah blah blah. I handed mine over, the officer checked it and she told me to take a seat and wait some more. (BTW, they did not require proof of funds or an AOS).
8. After about another 15 minutes I was called again and told that I now have to go pay the fee of US$840 (turned out to be about A$980). They gave me a card that I took to the cashier (they dont accept EFTPOS but do accept Credit Card payments). I paid and went back to the first counter to hand over the receipt. They then handed my original documents (birth certificate etc.) back to me and told me to take a seat and wait untill i am called for "the interview". Up to this point was where they basically ensured that all the documents were okay.
9. After another wait of about 20 minutes they called me to the counter again (for the interview). The officer asked a bunch of basic questions like "are you married", "how many kids do you have", "how old are you", "where were you born" etc. All the questions were pretty simple and I had the feeling they were just checking to see how your answers compared to what has been written on your application forms. This lasted approx. 2 - 3 minutes.
10. The officer then simply looked at me and said : "your application has been approved today" and handed me the approval letter. That was it.
11. The whole process took about 2 hours of which most of the time was spent waiting.
I seriously recommend ensuring that you have all the documents at hand, exactly as they ask for in the 2NL. It makes the whole process stress-free and really simple. As I said before, some people were clearly not well prepared and were still argueing/discussing/pleading their case by the time I left the consulate despite the fact that they were called to the counter 30 minutes before me.