Prior to the bombardment, the facade was a rich baroque front designed by Paolo Amato and was decorated with Solomonic columns and a statue of St Clare of Assisi.

The chapels walls had separate compartments allowing the nuns to attend services while remaining cloistered from the public.

The allegorical frescoes in the apse are attributed to Paolo Martorana, depict Christ granting the keys to St Peter.

The main altar is made with precious stones (lapis-lazuli, agate, and amethyst and colored marbles) and gilded bronze.

The walls host four paintings (1735) depicting events in the life of Saints Francis and St Claire by Guglielmo Borremans.