to get there the closest metro station is M L1 Red Line "Arc de Triomf", then you can walk down the avenue that is in front of the arc.
1. After leaving the metro, walk down Passeig Sant Joan (towards Ciutadella park)
2. When you get to the end, turn LEFT. This will be Passeig de Pujades. You should see the cafe on your left, on the corner a few blocks down.