From the Wikipedia: "This small building probably dates from the late 10th century. It was built as a private chapel for the Pahlavuni family. Their mausoleum, built in 1040 and now reduced to its foundations, was constructed against the northern side of the church. The church has a centralised plan, with a dome over a drum, and the interior has six exedera."

As for location, many pictures give gps-coordinates, so you can see for yourself.