BUS:  bus #13 stops right across the street. It leaves from Comte Borrell St. with Tamarit St. next to the  Sant Antoni Market. It stops at Plaça Espanya, too (metro L1 and L3). Get off the bus at the stop called Segura-Polvorí and across the street, behind the trees, there is a big, old stone house. You made it!
(Bus schedule here)     (Metro map here)

CAR/BIKE: drive trough Marques de Comillas Avenue where the Poble Espanyol is. Right after passing it by, bear right at the junction. You'll be driving around the Serrahima athletism field. In less than a minute you'll get to a crossroads. On the other side, behind the trees, there's a big, old stone building. That's it. There's a  tiny street next to it which leeds to the main door. There' s usually plenty of parking space (no meters!!!)

TAXI: a taxi ride from Plaça Espanya (metro L1 and L3) is only about 4€. Some taxi drivers do not know the area. Ask them to take you to the crossroads between Polvorí St. and Segura Street (see detailed CAR directions above).