How Ono Studio transformed a small studio in the city’s 10th arrondissement into a bright living space

The dining area and the bed are separated by a low wall and a curtain. Chair by Olavi Hänninen (1960s, Galerie Paradis); table (Kave Home); sheets, curtains, cushions, and table runner (Haomy); wall lights (Zangra); pendant fixture (Tikamoon); and vintage stool, screen, and decorative objects.

In the trendy Oberkampf neighborhood of Paris, a 300-square-foot studio offers an elegant lesson in efficiency. But as clever as the apartment itself is, the new owner of this apartment in the 10th arrondissement was actually attracted to the 1970s building when it came time to make his first real estate purchase. The large lobby in wood and green marble, pierced with oval windows and featuring a sculptural staircase , captured his attention upon arrival—but it was the unobstructed views from higher floors that convinced him to buy.…