Renfe Rodalies trains depart every 30 minutes from Terminal 2, from around 05.30 until 23.00, stopping at Sants Estació. From Terminals 1 and 2, the aerobus is blue shuttle bus that operates every 15 minutes from 05.15 until 01.00, stopping at Plaça Espanya and then onto Plaça Catalunya. The journey takes25 minutes and costs around 5€. The more intrepid amongst you might also try the local Nº 46 bus, which stops at Plaça Espanya and costs all of 1.60€.
The easiest way to get to your apartment is to take a taxi. You won’t have to worry about navigating the busy metro system or trying to read a map. The journey takes about 30 minutes and cost about €25- 30.