I spent a week at Hotel Principal in Barcelona last December and loved it. Very reasonable, clean, comfortable, courteous service, free internet access and an excellent breakfast buffet included in the rate. Close to Las Ramblas. Charming neighborhood which I could view from my little balcony with an interesting youth hostel across the street and a friendly little outdoor cafe at the corner less than a block away. Here's a link to their website:
www.hotelprincipal.es