@Isabel226 There are a couple of problems with this guest.
First, it is a third party booking which Airbnb prohibits. With a third party booking, not only do you not know who the booking guest is, but you also have no idea who the people are who will be staying. Under Airbnb's system, you will not have direct contact with the guests through Airbnb. Here's what Airbnb says about third party booking:
https://www.airbnb.com/help/article/427/can-i-book-on-behalf-of-a-friend-or-family-member
Second, be sure you are aware of the potential issues that come with long term stays:
https://www.airbnb.com/help/article/805/what-are-some-things-i-should-consider-before-hosting-long-t...
Third, Airbnb highly descourages pre-booking visits for your protection. Best to contact Airbnb so they can take an indepth look at the guest before approving. Most likely they will advise you against it as it is a third party booking.
https://www.airbnb.com/help/article/47/what-should-i-do-if-a-guest-wants-to-see-my-place-before-book...
Also, if a long term stay is confirmed, know that your cancellation policy will change as well as when you get paid. With stays longer than 28 nights, you will be paid for the first month after check in with the remainder a month later. The cancellation policy will change to the long term stay policy.
https://www.airbnb.com/help/article/92/when-am-i-charged-for-a-reservation
https://www.airbnb.com/home/cancellation_policies#long-term
Personally, there are so many problems with this reservation, I would not do it. The most concerning issue is that it is a third party booking. You might not be covered by Airbnb's Host Protection policy if you knowingly accept one. Also, asking to view the property is problematic from a security point of view.
Ultimately it is your decision, but too many red flags for me!