One problem was that it was located quite a distance from the city center, in fact, near the western edge of the city. My guidebook recommended a bus with a few transfers, but I looked on the map and came up with a simpler solution. I could take the very familiar electric tram westward and get off at the station located at the city wall (Topkapi station). From there, I could follow the wall northward throught the residential neighborhood until I found the church.
The church followed the same evolution as the more famous Hagia Sophia. It was first a christian church, then converted to a mosque, and finally changed into the present day museum. Its claim to fame was its collection of well-preserved mosaics on the ceilings, domes and walls.
Aerial photo of the location of the Choro Church (center of photo), located very close to the city's western wall
On exiting the tram at the Topkapi station, this was my first experience viewing the Istanbul city wall. I was to return later to explore more of this impressive wall.
Park outside the city wall, at the Topkapi transit station area - start of my walk to the Choro Church
Outside view of the relatively small Choro Church
One of the mosaics in an archway
One of the mosaics in an archway
View upwards of the main dome
The gift shop of the Choro Church is set within historical mosaics
Recommened Further Reading
Choro Church Museum Official Website
Choro Church Description with photos in Wikipedia
Tourist Review of Choro Church in TripAdvisor