On the ground floors of this 4,630-square-foot private mansion in Paris, potential buyers will discover beautiful wallpaper, unpretentious antiques, and charming, rounded windows. In all, elegance and ease, without (for better or for worse) much of the stilted chicness for which the city is famed. Downstairs, however, is where the real fun is: an indoor pool, room that is 100 percent jacuzzi, and some 6,500 square feet of garden. The ask? $8,412,718.