The walls of the Bathroom are marbleized in beige, cream and grey colours, made by the master Royal craftsman in this field, Jan Michał Graff. The ceiling is adorned by a plafond painted by Jan Bogumił Plersch, depicting Flora and Zephyr. The subject drawn from Fasti, an unfinished work by Ovid, tells a love story of Zephyr, god of the west wind, and Flora, goddess of spring and flowers. The corners of the oval plafond are filled in with flat stucco shell forms – an attribute of Aphrodite – goddess of beauty and love.

The marble fireplace located in this room corresponds with the colour scheme of the stucco wall lining. In the hearth lays a cast-iron board – Eagle and Pahonia under a crown – surrounded with a Rococo ornament, which indicates that it was made in the early period of Stanisław August’s reign.

In the concave quadrant wall, there is a niche, in which a tin bath once stood; it currently contains a vase – an amphora made of brown and beige coloured alabaster (mid-19th century). On both sides of the niche are oval stucco medallions, Bathing Nymphs, most likely sculpted by Giacomo Monaldi.

On the mantelpiece of the fireplace visitors will see a grey marble censer-vase, on the side of which two krater vases made of beige marble are displayed, and in the fireplace – Classicist firewood racks. The room’s equipment is complemented with pieces of Rococo furniture: a dressing table (puderezza; c. 1750), a small chair and a stool (c. 1765), as well as an inlaid commode.