The church is located in the west of Ntaou Monastery, when we turn right from the central road that leads from Rafina to Old Penteli, near a ravine. This road is called Kalission Street.
The katholikon is a domed, single-naved basilica dated to the post Byzantine period. However, there are indications – mainly from unpublished excavation facts – of an older Byzantine phase. This point is strengthened by references in Pope Innocent III document, " Abbatia Sancti Nicolai", "casale Calixtes" (1209), and Pope Honorius document "S. Nicolai de Kalliscia de Montepentelli" (1218).
Innocentii III. Romani Pontificis Regestorum sive Epistolarum libri XVI, Patrologia Latina 214-216, Koder J.-Hild F., Hellas und Thessalia, Tabula Imperii Byzantini I, Wien 1976, p. 179, Lampakis S., Memoires sur les antiquites chretiennes de la Grece, Athenes 1902, p. 39.