I just returned from a month in Spain including a final week at Hotel Principal in Barcelona. I recommend this hotel highly to anyone looking for a reasonably-priced centrally-located comfortable accomodation in this city. Hotel Principal is located a couple of blocks from La Rambla close to the #3 Metro Line. My room had a lovely little balcony overlooking a charming and quiet side street with many nice little shops & restaurants close by. I paid less than €70 per night which included a plentiful breakfast buffet, a security safe inside the room and free internet access in the lobby. The staff were very helpful especially Roberto who is at the front desk 4PM-Midnight. I would happily return to Hotel Principal again. Their website link is www.hotelprincipal.es.
If anyone has anything further they'd like to ask me about the hotel, feel free to contact me directly.