All of the cats like having stairs now. But Everett LOVES stairs.
When we're looking for him, we always check the stairs first, and usually he's there. Sleeping or just sitting. He's made walking down the stairs a bit of a sport too because he tries to trip people.
When the other cats are chasing balls in the basement, Everett waits near the bottom of the stairs and meows and maaahhhs to get our attention and then leads us to the stairs to throw balls for him to chase up and down. I was filming Zoe flipping when he did it last night: