This was a perfect place for our short stay in Barcelona. Very clean and quiet with a wonderful view from the balcony. Apartment is within walking distance from the metro station and bus routes.
Roberto gave us very nice overview of the city and hands on directions to the apartment. Apartment is close enough to walk around the city, but if you don't want to, get the bus/metro ticket. It is only €10 for 10 trips. Just use Google maps for directions and you can't get lost.