“SMALL ROOMS set the mind on the right path. Large ones cause it to go astray,” wrote Leonardo da Vinci 500 years ago. And though open-concept floor plans have dominated home design for half a century ...

The clue is in the name, a snug should be exactly that, a small, cozy room for relaxing. Snug room mistakes come about, however, when these compact spaces are jam-packed with furniture and clutter, ...