@Michael4414 The situation you posit does sound reasonable. Being reasonable is a different thing. This young woman who wants to book for 3 months- she is a total stranger to the host- how does the host know that what she's saying is true? How does he know if it is just an excuse to scope out the place, so her brother the thief and his buddies can come back and ransack the place?
If I were in that situation as a guest, I'd first of all look for an established host with a string of great reviews. I'd read all those reviews, some of which would likely talk about the area, the noise level, the host, etc. I'd message the host to ask about the things that might concern me, making it clear that I was a single woman who was looking to book for 3 months. Experienced hosts don't give out false information or make their place seem better than it is, because that leads to unhappy guests, demands for refunds, and bad reviews.
If it all seemed good, I'd go ahead and book. If I still had some doubts, I'd book it for one night, as far in advance of when I wanted the 3 month booking as possible- one would assume if someone is looking for a 3 month booking somewhere, they are planning ahead and have many factors to get in order, so making a brief exploratory trip would seem prudent.