The flat is really central I think 13-17 minutes from the placa de Catalunya. Less than a few minutes is the supermarket "Dia", that is really nice. So no far away from the sights of Barcelona. The metro station Urgell is maybe 3 minutes away. With the metro the stations like placa de espanya, placa de Catalunya and other central sights are 5-7 minutes away.
But the beach and the Port Vell are more than 30 minutes away to walk. And clubs like Shoko, pacha, opium catwalk.. are more than 40 minutes away to walk.
Norman was nice to us and help us if we need some help. He answer really fast and the flat is OK.