Traditional Stereotype christian clouds pretty people with dove like wings and white one piece robes.
By several others beautiful gardens (akin to the garden of eden)
Some interpretations I know of simply treat it as paradise, some even more specifically as your personal paradise as why wouldn’t a god/pantheon of gods be able to do that
More general Simply a place that makes you perfectly content, to some it’s sitting on a couch with someone you love under a blanket, others sailing the sea.
And then the many many sex/sexy partner fantasies that people will say is heaven