The apartment was fantastic for many reasons. First Alvaro & Pol were extremely responsive to all messages which made the booking and check-in processes as easy as possible. The apartment itself is very cutely decorated and was spotless when I arrived. As others have mentioned there are several flights of stairs to climb with no lift, but that is noted throughout the listing. The location is great, and easily walkable to sagrada familia, the metro, gothic quarter, and I even walked to Park Guell which was a bit further than the others. There are several markets and restaurants nearby and the two main streets for restaurants were just five or six blocks west.
Overall a wonderful stay, will definitely be staying again when I return!
Quick note they own several of the apartments in the same building and they are all similar layouts and renovated, so I recommend checking out one of their other listings if this one is booked!