@Sonia1249 Well, it's good that you checked with the host first. Some hosts are okay with 3rd party bookings, depending on the circumstances.
The main problem with these bookings, especially if it has been booked as a surprise gift, is that the person who is staying hasn't read the listing information. So they can arrive with expectations of things which the host doesn't offer, be completely unaware of the house rules, etc. Of course this will cause issues for both the guests and the hosts, so just make sure that your friends are informed beforehand of all of that.