Julia's place is in the best location ever. You can see the metro stop from the patio window. My partner and I didn't take public transport because we enjoy walking and nearly walked the entire city of Barcelona. From Julia's apartment you can walk to nearly everything - we even walked to the beach.
The only reason I did not give this 5 stars is because of one hiccup. On our last night in the apartment, we came back from grabbing snacks and our door key to the building did not work. A neighbor in the same building walked up a short time after and her key did not work either. Luckily, she was able to buzz someone upstairs to open the gate to let us all in. This happened at about 23:30 and we would have been in big trouble because we did not have our phones on us, because we just ran across the street to the convenience store. Thank goodness for neighbors!
A couple things I'd note is that Julia's apartment is on a busy street. If you are a light sleeper I would recommend bringing ear plugs. Additionally, if you are light-sensitive while you sleep, you should utilize the window covers hidden in with the sliding doors. Those were life savers!
The hallway can be a bit loud, as well. There are other AirBnb's on the same floor and sometimes the other guests can be loud. Again, earplugs would've been wonderful for me!
Other than that, I can't say more great things about this apartment. It's spotless, comfortable, and has air conditioning which was wonderful after hot summer days!
Coffee recommendations within walking distance: Satan's Coffee and NOMAD coffee. Both excellent, craft coffee shops if you are not looking to sit at a cafe and would like something for take away.