Be careful with links like this, they are not official.
https://airbnb.com.longterm-listing.com/rooms/678987
If you suspect fraud contact directly with airbnb to ask if the ad is trustworthy.
I was looking for a place on uniplaces and found this:
https://www.uniplaces.com/pt/accommodation/lisbon/212521
It looks too good to be true. I contacted the landlord by whatsapp, and she told me to book by airbnb, which doesn't have fees. However the link was fake.
The number was this: +44 7466 251910
DON'T TRUST THIS PERSON! Just a robber!