This apartment was by far the best location that we stayed in during our trip. It's right near Plaça de Catalunya, and the Gothic Quarter, La Rambla, and El Born are all within walking distance. The apartment itself is also beautiful - exposed brick on the inside, a balcony that overlooks a bustling intersection. Albert was very communicative and helpful when we arrived and left the city.
My *only* complaint is that we were asked to pay a Tourist Tax when we checked in. It was only 40 euro, but it was unexpected and made us feel a little apprehensive. We looked into it, and it is a real thing that is out of Airbnb and the hosts control. If you book with them, just be sure to ask what it is so there are no surprises.