@Nicole2143 All that is required for Inquiries is that you message the inquirer back with 24 hours. And you only have to respond once, not to further messages on that original inquiry.
This sounds like a combination of a new user who doesn't understand how things work, and a language barrier. If it were me, I wouldn't simply not respond, I would say something like "Hi XX, It seems that you don't understand that my listing is a private room in my home, not an entire house. Also, if you want specific answers to something, you need to ask specific questions. "The security and environmental problems around the house" is a strange question- I don't know why you would assume there are problems? "