My fiance accompanied me in my interview and everything went fine. We were interviewed by a chinese american consul on her 25s. I think its a plus point that I was with my fiance because we were just asked a few questions like.
1. is that you're fiance?
2. when did the two of you meet?
3. when did you start dating?
4. my fiance was asked about his work in the US
5. lastly, she asked us, when are we planning to get married? we both answered "as soon as possible!"
that's it, the consul congratulated us and told that my visa is approved. I was like "that's it?". lol.