Not everyone has the luxury of a separate home office or a room just for working out. Sometimes, you’ve got to squeeze a play area in the living room, take work calls in the kitchen, and maximize a spare room to its fullest potential. But how do you combine these different functions into one space without it looking cluttered and chaotic? We asked interior designers to spill their top tips for achieving a space that is equal parts versatile, stylish, and harmonious.