22 year old man looking for an accommodation in Barcelona

My name is Adrián, and I'm 22 years old. I'm originally from Boston, Massachusetts. I recently graduated from Harvard, where I studied Mechanical Engineering. Within mechanical engineering, I'm more specifically interested in human-centered design. I want to bring these techniques to communities in need, especially the Latinx community. This fall, I'm starting my gap year and plan to travel around the world, spending my first month in Barcelona! My family is originally from Puerto Rico and Alaska, which gives me a diverse heritage and tons of great experiences. I'm fairly fluent in Spanish and consider myself very connected to my culture. I'll be working virtually from Boston for a tutoring agency and plan to take most of my calls at a library. I also love being outdoors, playing soccer and thrifting. I have some friends from college who live in downtown Barcelona, so I'd love your guidance on the best places to explore!