Vila lives in Catalonia, Spain, not because of any particular reason, but simply because it's where she was born and raised. You could put her in almost any comfortable dwelling (so, not a hovel) and she'd be perfectly content, though because of the way she grew up she naturally tends towards abodes of opulence.
The mansion itself is fairly typical of what one might imagine when they hear the word. However, one notable part of it is just how empty it tends to feel. Though many of the residents of the estate have grown accustomed to it, and Vila certainly isn't bothered by it, it's incredibly noticeable to any guests. There are a great many rooms in the Young estate, but very few of them are actually used -- most of them are left abandoned to gather dust, including entire wings. As a young child, Vila enjoyed exploring these abandoned wings, but nowadays her interest is no longer captivated by these places in which she knows every secret.