From Kasbah, you can walk over to Madrasa Slimania (all places within medina will be walkable within today's itinerary).

This is a historic madrasa in Tunis, Tunisia, built in 1754 by Abu l-Hasan Ali I in memory of his son Suleiman. Known for its beautiful architecture with a porch at a higher level, colorful marble mihrab, and locally made faience panels, the madrasa has been restored and now serves as the headquarters for various medical associations. It's a cool spot to check out if you're into Ottoman-era monuments and want to soak up some history in the medina of Tunis.