Return downstairs and pass through the Caryatids room to the hallway in front of the Venus de Milo (Room N°346). Turn right to Room N°347 and pass through Room N° 408 until you reach the stairs to a vast gallery dedicated to Roman sculptures (Room N° 406). Continue straight to the room with the four alabaster and black marble statues (Room 404). Keep going until you reach some stairs. Room N°403 (the so-called Michelangelo gallery) is right there. The sculpture is to your left as you enter the gallery.