I too am looking for a semi-permanent regular companion.  Trying to find the right match is the problem.  Is it possible that some of the level headed escorts could meet me for a cup of coffee at a restaurant at their choice, in the daytime to see what kind of character we each are dealing with?  I would think, that this just is common sense.

$300.00 per hour Semi-permanent??

Why not go for a regular appointment and see if she's the right match?

Set up a one hour appointment with each one until you find the one that you love spending time with. Keep things in perspective, this is a business of lust and satisfaction of lust, do not allow romance to enter into the equation because you will regret doing so.
You seem to be looking for what some hobbyists call ATFs, those are ladies that they see again and again because of a positive connection and great sex.

Obviously, I realize this is not a dating site.  Since I have never done this before, I am very skeptical on the type of person for an intimate hour or two.  I would think that my counterpart would have the same reservations.  Just trying to get some feedback from the non-newbies since they have the experience and I do not.  I would also think that some of the providers reading this message would jump at the chance to show the ropes to a newbie or whatever I am called.

types, they usually have a good sense of how to handle themselves.
As I pointed out earlier, choose 3-4 ladies that interest you, read reviews on what they are like and book a single hour with the ones that strike your fancy after you are educated. If you follow that regimen in a disciplied fashion, you will find one or more ladies that ring you bells.
As the alias of one poster says, "itaintfuckingrocketscience".