the interior walls of the early baroque building are embellished with painted prayers, visible after conservation removed covering layers of paint. the vaulted ceiling is embellished with baroque plasterwork wreaths and garlands. before the nazi occupation of poland, the synagogue boasted a widely-admired, wooden, baroque aron kodesh. when the building was planned, the design was considered by some diocesan officials to be too beautiful for jews to have, which led to delays in the synagogue’s construction. architectural historian carol herselle krinsky considers the isaak (isaac) to be "the most architecturally important" of all the old synagogues of kraków. according to krinsky, the womes's gallery and exterior stairs leading to it are a later addition to the building.