I.O Café is a small café in the Marais district of Paris, next to the ofr bookstore, serving coffee, croissants, and desserts. It also offers simple meals and desserts including a ham sandwich, apple pie croissant, pound cake, cookies, and chocolat chaud. Each coffee differs in taste, with the americano on the acidic side and the cappuccino less so. Desserts and food items tend to sell out quickly.