@Isabelle623
You wrote "To explain properly, I booked and then re-read the description and realized that it mentions that we must send a mail to ensure that we have a confirmation"
Was the email address of this "host" visible in the listing description? If yes, then this is usual version of a scam that's been doing the rounds for years... guest emails host, as requested. "Host'/scammer now has guest email address, sends a response containing a link to an identical - but fake - Airbnb payment page, guest sends payment via dodgy Airbnb page. Game over. Guest loses. Scammer wins.
If the "host" email address wasn't visible anywhere on the host profile, then that's a rather more tricky and cumbersome proposition for the scammer, as it depends on the guest not realising that Airbnb has already deducted the funds from their account at time of booking. A risky strategy, but given how little attention many guests pay to details, still totally doable.
In response to a series of negative media reports a couple of years ago, about guests regularly being scammed on the platform, Airbnb claimed to be putting into place a myriad of new features to ensure that scammers could no longer exploit the platform’s lax security measures to use fake listings with the intention of robbing people of sensitive financial information. In April of 2017, the company announced that it had begun using artificial intelligence technology to help detect fake listings, and would delete them even before they could go live on the site.
Using a number of methods such as “host reputation, template messaging, duplicate photos and other discrepancies”, its machine learning algorithm supposedly flags listings that are likely to be fake and screens them for review before they can go live. However, despite this, fake listings and/or phishing scams are still commonplace on the platform. While Airbnb is now posting clear warnings on the site for guests not to communicate with hosts or make payments offsite, little appears to have been done to verify actual listing addresses. Booking dc, for example, sends out a verification code by regular mail to each property, in order to confirm the listing address. Airbnb does not. (The exception to this of course, is the Airbnb Plus collection, whose listings are all visited in person by a photographer/checklist inspector)
When booking as guest on Airbnb, always safest to do a reverse image search of a listing's pics first, to check if they pop up elsewhere.
https://www.businessinsider.com.au/airbnb-fake-hosts-and-listings-2018-6