I'd also incorporate dumbwaiters and various chutes where visiting children could whisk their toys into various other realms and dimensions.
Fires would burn in each of the parlors and living rooms. Warm-stoned mantles and a fluffy cat to sprawl in front of it — such would be a common sight in my house, never failing to influence a smile on the faces of all who peak inside the various upstairs rooms.
You could find me very often in my study, working diligently at my mahogany desk and always eager for the interruption of a long-missed visitor. You would come in and peruse the hard-bound folios of my personal library and ask me about my latest projects, the exploits of ongoing expeditions around the globe. I would invite you to the terrace where we would enjoy a cup of tea, all while admiring the peacocks traversing the lawn below — or the changing shades of yellow and green foliage on the distant mountains.
Before building the house, I would bless the ground, doing my best to calm the spirits of those who had settled and wandered there before me. I would welcome them to haunt the stairwells, to make funny faces at people as they gazed on the looking glass in the washing rooms.
And once I had journeyed on from this earthly station, I would hope to have my remains carried down to the glen below the ridge, left to bask in the open meadow where the sun hits at morning, resting in the matronly evening shadow of my former home.
The grandchildren would tell stories to their grandchildren of the benevolent lord who once took them on candlelit adventures through the network of hidden portals, an entire labyrinth — a second residence — within the walls of the hillside manor. Visitors and subsequent residents would be discovering new treasures and secrets for generations to come.