Obviously the OP is trying to make the best decision based on the info he HAS. Of course he'd like to know the host better but that's not an option.

I spent quite a few years of my childhood in Wuhan, and I agree with previous comments the intentional harms are unlikely. Especially in populous areas like Wuchang. A foreigner is LESS likely to be kidnapped for obvious reasons.

Do check out the female host carefully. If she's a college student, then go for it. If she's a street merchant, avoid. Understand what her motivation is to be your son's guide! What would she get in return? IF that's not clear to you, pay extra attention. Practicing English isn't a bad reason, especially if she's a student.

Have a contact with a Chinese phone access who your son can call then you should be golden.