Here is a list of what I find important in order of preference:

1. That she looks like her pictures.

2. She MUST have a friendly, "I'm glad you're here attitude." Let's face it, I'm visiting to have someone pay attention to me.  A business like attitude is understandable, but a mood killer.

3. If her place is not clean or there are clothes everywhere, I get nervous.  Makes me think there are gangsters around, ready to beat me up and take my money. Once again, it's a basic customer service thing.

4. The conversation is important, but I don't expect Oscar Wilde like reparte'. If she talks too much, that's a turn off. If she listens, that's a turn on. Eye contact is important in any conversation.

So basically I want to be treated the same way I would treat anyone else. It's funny that so many people in this world have a hard time remembering something so simple.

Probably a little of everything you've mentioned above.  If it's good, those first few minutes provide a feeling of relaxation and comfortability, and really set the tone for what is to come (no pun intended).  I'm sorry we've never met, because one who is asking a good question like this in undoubtedly one who will go above and beyond the norm to please her companion.  I hope our paths will cross in the near future, and let's see what those first few minutes will be like--my guess is they'll be passionate, intuitive, and caring.
Wish you aren't so far from Barona!

Actually, for me, one of the best times I've had, was with a lady whose initials are VVH.
I walked in the room.
I said 'hi'.
She said 'hi'.
And we instantly went into an incredible, passionate liplock that must have lasted at least 15 minutes. I found that to be a great turn on.
We got to know each other during the first break.

I pretty much have to agree with Jeffery, it's all the things you mentioned. Since I rarely ever do incall, that's never been an issue for me. For me as important as the fact she looks as good or better than her pictures, I think her being relaxed (which will relax me) a friendly attitude and good eye contact are key to having a great experience.

This may sound a bit strange, but one of the biggest thimgs for me is  " does she call me by my name ".
I HATE being called sweetie or honey. I have a name and I like to hear it.
I am amazed at how few ladies will take the time and trouble to remember and use my name.
In my business life I have been to many, many sales/mkting seminars and they always advise us to learn and remember and use our clients names. And in my business I do.

Often times I could tell if I was going to have a great time even before we meet like when we communicate through emails or phone.

I pretty much agree with everything posted by the others. What I watch for is a certain look that indicates that you desire what is going to happen. All the women that I have experienced this certain look from have been outstanding in their profession. Attempts at acting the way you think the guy wants is transparent as are faking your orgasms, men that are totally into the situation and are sexual by nature know the difference. This look is what I watch and wait for, the best don't even know they are doing it.