This apartment is extremely central, connected to all subways and trains at a 3 minutes walk distance as they are located in Paca Cataluna/ las Ramblas. You can reach all city landmarks within a 2 to 15 min walk (depending on the monument).
The room is quiet and the apartment is elegant and bohemian. It has a double futon.
The building has doorman and elevator, you can't beat the pre-modernist charm of this apartment. You are right behind Placa Universitad, therefore you can truly walk everywhere and save on cabs and public transportation. In any case all mayor trains are here and you can plan trips out of town and come to and from the airport with no stress and cheap, public transport in Barcelona is excellent.
You are very close to CCCB, MACBA and other important city landmarks, infact you can't be more central than this ...
I can give you info on architecture and itineraries of the city.