Great stay. Beautiful, quiet apartment in great location. A/C throughout. Pharmacy and organic grocery store on the same block, and multiple great restaurants within minutes on foot.
If you are planning to use the kitchen, I recommend touching base with host in advance to see what food/cleaning items will be available on your arrival.
Last, several reviewers commented about the additional tax to be paid in person (4,40€ per person per night during our stay), but my understanding is that this is standard for any Airbnb stay in Barcelona per city laws.