@Marilyn157 Airbnb does everything they can to block direct communication before a booking is made: that includes any attempt to provide an address. That's a pretty clear statement that pre-booking viewings are discouraged by the platform.
Personally, I just say no and leave it at that. I did a few pre-booking viewings when I was new, and they were inevitably either tire kickers or they wanted to haggle for a low, low price and wanted to book outside the system. In my experience, it's just not worth it. All the info they need to book is on the site, and if they have any questions that they need answered they can ask you: there's no need for a visit.
I had a Superhost do it to me in my first couple of months of hosting: they met me and gave me a big sob story about how they had a flood in their house and needed to replace flooring before they could go back to living there. What had in fact happened was that they had rented out their entire home on Airbnb for about $1000 per night and were staying at my place for about $65 a night. Never again.