The Church of Panagia Kapnikarea or just Kapnikarea is a Greek Orthodox church and one of the oldest churches in Athens.
Wikipedia https://en.wikipedia.org/wiki/Church_of_Panagia_Kapnikarea
Address 53 Ερμού, Αθήνα 10563, Greece
Coordinates 37°58'34.967" N 23°43'43.103" E