Stay in this airbnb. It's convenient to two metro stops, is in Sant Antoni, which is a completely non-touristy part of Barcelona, and every single restaurant and bar within a few steps of this Airbnb is very good. Plus, the building has an elevator (necessary,since the airbnb is on the top floor of this 6-story building... Over 100 steep steps to get to the place).
Be aware that the airbnb is managed by an outside company, You Stylish, which is a nice group of people. You can leave your luggage in lockers at You Stylish. You Stylish will arrange taxis,etc for you.