Where's Ariana?
She's in the kitchen.
Where's Garfield?
He's in the dining room.
Where's Homer?
He's in the bedroom.
Where's this angry bird?
It's in the study / home office.
Where's Marge?
She's in the attic / loft.
Where's Bart?
He's in the garage / workshop.
Where's Angelica?
She's in the bathroom / toilet.
Which room is this?
The living room... Or maybe the front room... Or the lounge (North American).
Where's Homer?
He's in the basement / cellar.