On the map you can see where the apartment is located:

There are 2 options:
1) Bus or train.
From the airport you can take a bus or train to the centre of Barcelona (stops: Plaça Catalunya (bus) or Catalunya (train)). From there you can take the green subway line to the stop Paral.lel. From this stop you take the street Avda. Paral.lel in the direction of the sea. If you come to an old Roman wall the apartment is around the corner. Take the street Portal de Santa Madrona and just to the left you will find the street Ramón Berenguer el vell.
The street Ramón Berenguer el Vell is parallel to the street Avda del Paral.lel.
2) Taxi.
A taxi is a quick and easy way to get to the apartment. A taxi is advisable if you arrive with two persons or more, you have a lot of luggage or you arrive at the airport after 20:00.
Note:
Buses leave every 15 minutes from the airport, until 24:00.
The subway is open daily until 23:00, and on Saturdays and holidays until 01:00.
In the city there are also numerous night buses.
A taxi from the airport should cost around 15 euro's. Advise: before leaving ask about the price, to prevent surprises (you can show the driver the map with the location of the apartment). With the taxi the trip should take about half an hour.
If you want to come by car you can find an overview of highways near Barcelona.
We wish you a pleasant trip!