I'm very sorry that you had such a disappointing and unprofessional experience. However, the unfortunate situation with the provider in question is a case by case situation only. Nonetheless, I do understand your caution and apprehension in dealing with other providers with similar variables (i.e., no reviews).
As a fairly new provider, I have seen several clients who were very pleased with my service; however, they either do not give reviews for any provider per their preference or they don't feel completely comfortable with giving a review because of possibly revealing their secret leisure adventures that per their perspective could possibly ruin their families, careers, etc..., which isn't a risk that they are willing to take. Unfortunately, that has left me without reviews at the moment; however, I respect my clients decisions to review or not to review without pressuring them outside of their comfort level.
Of course, your reservation about providers without reviews makes perfect sense because as with any job, if you don't have 'experience' to show, there is a risk of you either being great or absolutely horrible. I completely get it.
I'm unsure as to why the provider in question would make an arrangement and not honor it or even communicate to you the reason and also provide accommodations that she will offer for your inconvenience. Once again, I am sorry that this happened to you. However, please understand that no reviews doesn't equal law enforcement, bad service, no shows, etc... I would suggest to do your research on any provider that you choose, whether they are highly reviewed or not.
Best wishes

-Abla