Whether you like it or not, tourists live by TripAdvisor. Claim your listing. Upload professional photos of your best food and drinks (users upload terrible, blurry photos).
Encourage reviews: A simple "If you enjoyed your coffee, we'd love a review" from a barista can go a long way.
Respond to everything: Identify yourself as the owner. Thank the 5-stars. Apologize and offer a fix to the 1-stars. It shows you care.