The main railway station in Barcelona for both international and national destinations. It's located in a modern building and all the platforms are located underground. Two metro lines stop here (Green and Blue line), the international bus station is nearby. Renfe train heading to the airport leaves from here every half an hour and the trip takes about 25 minutes. WiFi is not available at the train station, but it's available in McDonalds and Ars Cafe.
Wikipedia https://en.wikipedia.org/wiki/Barcelona_Sants_railway_station
Official Website http://www.adif.es/es_ES/infraestructuras/estaciones/71801/informacion_000097.shtml
More information https://www.renfe-sncf.com/rw-en/services/stations/Pages/barcelona-sants.aspx
Address 1 Plaça dels Països Catalans, Barcelona 08014, Spain
Coordinates 41°22'44.443" N 2°8'23.856" E