 Maybe an airport ride offered when the taxis are on strike Maybe a shuttle service when this happens It happened to me The subway is very easy to use clean and cheap A print out of the metro to the airport the fares and how to buy the tickets although the receptionist was very kind and explaned to me gave me a map I was still very nervous about taking the subway I bought one extra ticket that I did not need but overall it was very easy to go to the airport indeed there is no need for a permanent shuttle For 4 50 the airport is almost at your doorstep from this hotel 
 My room had a view of Sagrada Familia The toiletries were top notch The staff was very friendly and helpful There was fresh cold water at the reception umbrellas when it rained There is a reasonably priced breakfast buffet and a bar with tapas drinksxand coffee I forgot to try the top roof terrace bit there is one with a wonderful view of Sagrada 