Budapest, Szent István tér 2, 1051 Hungary | Meet your guide in front of St. Stephen's Basilica Ticket Office. It is on the square, 50 meters to the right from the steps of St Stephen's Basilica, next to the Starbucks coffee shop.
Your tour guide will hold a sign "Guided Tour", staying a few meters away near Starbucks, if there is a crowd at the ticket office.