Paperwork and public services
KEP (Citizen Service Centre)
In short
A public office where you get many documents done, such as certificates and confirmations.
At KEP you can submit or request many public applications, with help from an employee.
Many of these are also available online on gov.gr, without going in person.
Before you go, check on gov.gr which documents you need, so you do not have to return.
Official source: gov.gr (Greek government portal)