Overall, a very good stay, and I would recommend the apartment. Note that the experience feels more like staying at a hotel than it does staying at an Airbnb.
Pros: Excellent location close to Diagonal Metro / Passeig de Gracia. Beautiful balcony. Great air conditioning. Comfortable bed. Pristine bathroom. Daily cleanings.
Cons: Wifi was basically unusable (I ended up just purchasing more cellular data). No coffee maker / provided coffee that I saw (In fairness, I don't think the list references one, but I've gotten so used to having them at Airbnbs).