Sorry for the distort-o. I followed the map to the Catholic Cathedral and found myself here. It’s very plain inside too. I got to say 2 of my 4 Greek words! I saw the priest walk by and I said ‘parakalo!’ (please) and simultaneously made the turning-the-key gesture then I said ‘efkharisto efkharisto’ (thank you thank you), and he opened the door!
No photos allowed though.