Doppio is the espresso bar that can be found in many cities in the Netherlands. The coffee is quiet bold, bitter and no too fruity.
My firs visit on Doppio is at Doppio Groningen. In Groningen, I can say they serve a good coffee. What I like about this place is their “newspapers” that gives some coffee-information. If you are curious to know about that information you can take a look at their website.
Doppio Groningen http://www.doppio-espresso.nl/vestigingen/groningen
Brugstraat 6 Groningen