Coffee expert Corby Kummer says it's the small details that matter in a great cup of espresso. When you go into a coffee bar, look around for these signs that the establishment knows what they're doing and care about serving you the best:

1. The coffee beans should not be stored in a clear container.

2. A coffee grinder should be next to the espresso machine. If they are using pre-ground coffee from bags, it's not a good sign. Ground coffee goes stale very quickly.

3. Barristas should be rinsing the espresso insert with hot water between each coffee.

4. Cups should be hot.