Very central and convenient to downtown Barcelona. You can walk anywhere or catch the metro to anywhere in the city. It's a 15 min walk to las ramblas from here and a 5 min walk to multiple shopping areas and food locations. There's a 24hr liquor store opened right across the street.
I felt safe the entire time in Barcelona and in this neighborhood. Be prepared to walk up flights of stairs to get to the apartment, there is an elevator but only one and very small. Overall a very nice apartment to stay at. Wish my vacation was longer.