What does VAT mean for Greek Hosts ?

[Theano1]

What is  the VAT number necessary in the profile of a host?

[Theodore29]

It's not necessary, it's on the optional part of the profile. It's about the VAT that Airbnb charges when it issues an invoice of their service fees (every time you host someone). The Airbnb explanation is:

For European Union users or users in other countries for which VAT applies, VAT will be assessed on our Service Fees. If you live in a country where we need to charge VAT, you will not be charged VAT if you enter a valid VAT ID Number.