Idk about top 20 but I'll tell you a few must-visit cafes in the city - Cafeteria & Co., Cafe Delhi Heights (for the Juicy Lucy Burger), The Woodbox Cafe, The American Connection Diner (for 34 inches pizza, Gangnamkorean, Yeti -The Himalayan Kitchen, Fat Jar & Cafe, Leo's Pizzeria (for their pizza), Nik Baker's, The Milkshake & Co., Nando's (African cuisine), The Big Chill Cafe, Chili's, Cafe Wink and Diggin.