The Catalonia Aragon is all right, a bit like a Holiday Inn. It's near Clot Metro station, not exactly in the centre of the city but not too far out, and easy to get to the city centre by Metro.
Try Hotel Jardi, which is off The Ramblas. It overlooks Placa del Pi and Placa Sant. Josep Oriol 1. We had a room with a small balcony - wonderful, but be prepared for some noise outside. It was about 40 euros per night (breakfast not included) and was very clean.Would go there again.