Contact etiquette

I tried contacting a provider and after seeing some recent reviews I thought to ask if her location was a residence or safe hotel. She seemed to take great offence to the question.
Was I out of line or is there a better way to inquire?

A lot of them are picky. as long as you don't inquire about their service I don't feel too much is out of bounds. We are the customer and there are a lot to choose from.. don't be offended and just move on to the next if you have to.