"And there's the rooms to be got at, and all the rough"

[purplerabbits.livejournal.com]

Forgive me if I'm misquoting cos I don't have the book in front of me, but does anyone know exactly what mrs bertis means by "getting at" rooms and what "the rough" is since, at the risk of exposing myself as a slob, I am no wiser than Peter about housework that isn't washing up and laundry and the like...

Long time listener - first time caller as they say