If he’s a new host without any other listings,
he will be motivated to get good reviews for his listing to get off to a good start.
He does have a flexible cancellation policy,
(Look this up to see what it means for you, depending on how far away you are from your booking)
so if you have serious concerns you could always look to see a similar property that also meets your needs with someone who has been reviewed and is more responsive to your questions.
On the other hand, as a host, just a tip:
sometimes if somebody has a *lot* of questions we worry that they might be a bit high maintenance or difficult to satisfy.
I don’t know what’s best for you, but if I were in your situation I would book a place with several reviews that might answer some of the questions I had, especially if he doesn’t respond to your messages after a day. Cancellations are hassle free within 48 hours of booking, but with a flexible policy as he has, you may still be able to get your money back depending on the dates involved. See what else is out there.