Peter Avis, the restaurant manager at Babylon, outlines four elements of great customer service: 1) having a strong staff who are informed, trained, and feel like part of the business, 2) staying ahead of competitors by analyzing them and having lunches with them, 3) providing "WOW factors" like knowing guests and rewarding loyalty with small impacts, and 4) gathering feedback from various sources like mystery diners, reviews, mail, and cards to improve service.