I recommend this airbnb. The area is quiet and feels safe (for a girl living alone). It’s walking distance to the beach. And this side of the beach is not as crowded as near barceloneta. The metro station L4 is very close so it’s easy to travel into the center (but if you like walking then it’s a 20-30min walk to the center). The airbnb itself has all you need and feels clean. It’s spacious. The hosts are very friendly and communication is fast.