A good decaf espresso is one that maintains the same rich, creamy texture and bold flavor of regular espresso, despite being made with decaffeinated beans. It should have a well-balanced taste, with notes of sweetness, bitterness, and acidity, and a long-lasting crema on top. The decaffeination process should not affect the overall quality of the beans, and the espresso should be made using high-quality, freshly-roasted beans to ensure the best possible flavor. Finally, it should be served in a small, pre-warmed cup, and enjoyed slowly for the ultimate coffee experience.