The ornamentation of this small room includes the Mazzetti coat of arms in counterposition to that of the family of Elena Caterina Ponte di Casalgrasso (silver, red saltire), the wife of Giovanni Battista.

The vault has a fine stucco decoration dating to the 1720s, which encircles the central fresco and the mixtilinear frame appears supported by elegant, elongated Four Seasons.

The mural depicts The Toilet of Venus and is stylistically similar to the frescoes in the Sala dello Zodiaco, attributed to Salvatore Bianchi (Velatee 1653 – 1727).