Which museum in Florence houses Michelangelo's early marble relief 'Madonna of the Stairs'?

The museum in Florence that houses Michelangelo’s early marble relief Madonna of the Stairs is Casa Buonarroti.

The relief was carved around 1490–1491, when Michelangelo was about fifteen years old. It is a shallow marble relief, or stiacciato, showing the Virgin seated in profile while the sleeping Christ Child turns across her lap. A staircase and several loosely sketched putti appear in the background, giving the work its modern title.

Casa Buonarroti is the former Florentine family residence associated with Michelangelo’s descendants. The artist never lived there as a finished museum; his nephew Leonardo acquired and displayed works connected with him, and the building was later developed into a memorial museum. The Madonna of the Stairs returned to the family collection after being given to Cosimo I de’ Medici in 1566.

A common mix-up is the Accademia Gallery, which is famous for Michelangelo’s David. The Bargello and Uffizi also hold important Florentine sculpture and art, but not this relief.