Set up a meeting with a non-fs provider who has 6 excellent reviews over the past 6 months. Setup incall...but then she says there are going to be people over and e-mails me a hotel address.  So forget 2-call, the address is out in the open.  Seems odd..but again, the provider is well reviewed, as recently as 15 days ago.  How concerned should i be?

Something came up at her incall. Perhaps she dropped a glass on the carpet and does not want you to get cut. Anything normal could have happened. Don't be alarmed unless you have not done your research on her.

to give the address at the time the appointment is made instead of using a two call system.

I believe they are comfortable doing that because -
1. That is what a therapeutic-only massage provider would also do.
2. They have a substantial amount of time with you on the table to assess whether or not they feel comfortable enough with you to put a smile on your face.

She may have out of town guests at home (if she works from home)...  Holiday season...  N Big Deal
Has she given you a Room Number or just the name of a hotel...  you'll still have to call to get the room.

Happened to me when I was a newb, changed location at the last minute, actually it was call one of the 2 call system.  I was shaking like a leaf, driving to the new location.  Had a great time, once I got my wits about me.  As stated in previous posts, she's well reviewed, shouldn't be a problem, but caution should be observed. Good luck!

gave you the room # in advance, run, don't walk, away.

Weather the provider's original location was a solid place or just a tent that she can easily fold up and move 5 blocks north...or south... In the business the tent is usualy a hotel room...