Possible Clues:

• What Dante wrote of differed from Perec's novel
• It's guarded by the three-headed dog Cerberus
• Entertained everyone sitting initially in the pit
• Sunglasses but no sun initially? Hell!
• Epitome of hotness
• Cerberus guards its gates, in myth
• The Greeks' Pluto
• Hell of a location?
• Devil's place
• Underground bosses moving east