First seen when Cyril died from zombies in comic #16, the entrance is the Column O' Light which beams down straight from the clouds.
The Waiting Room is basically just a floor of clouds (comic #23) but there is access to The Pearly Gates Pub where Cyril waits and drinks with Remmy while they talk about Maxx's future.
NPC s only stay dead for one night.
This night passes fast for them. They cannot see the ground from The Clouds.