I stayed at the Hostal Bianco II for two weeks...that finished about 3 weeks ago. There is a review I wrote somewhere on the accomodation page of MM bulletin board. But, a short answer (because there is a longer one in another posting)would be: the place is perfect. Clean; modern; centrally located; has A/C (that you control); and an elevator. It's midway between Sol and Neptuno...maybe three streets from Plaza de Stª Ana. The people are extremely nice.
I would strongly recommend the place.