I love the idea of getting married/having dinner in the Scottish castle. Or maybe staying there for a weekend. I wouldn't want to live there, though.
I could totally live in a mansion.
A lot of the dorms on my college campus was made up of mansions, and I stayed in one my junior and senior years: a quad (in what used to be the main part of the house) and a single (in what used to be the servants' quarters).
The air circulation in the quad was great. When the weather was nice, we left the windows open all the time.
Not so much in the single room. It was either really cold or roasting in there.