Thank you for posting your personal experiences with CHC. I can appreciate how difficult it is to share a bad experience.
I am, however, grateful that you did share it.

I have been in contact with Gloria about accepting a position with them and as you said it seemed quite professional and didn't raise any flags.
Your comments allowed me to ask appropriate questions that I might not have thought of, like "do the accommodations come with pots/pans/dishes/linens/curtains/toaster/kettle/etc as teachers coming from around the world won't have these things nor want to go out and buy them?" I also asked her about obtaining working visas prior to entering the country because working with a tourist visa is illegal.

She answered my easy questions but ignored those questions.

There's my flag.