Customers of Let Them See Cake in Cardiff praise the bakery for its delicious cakes, attentive service, and charming ambiance. Highlights include the perfect birthday and wedding cakes, as well as the delightful brunch options. The bakery's ability to customize cakes with personalized touches and fresh decor is highly appreciated. However, some minor service issues were noted, such as occasional confusion with orders and seating arrangements. Overall, the bakery receives high marks for its tasty offerings and pleasant atmosphere.