Location, location, location. Was within walking distance of almost every place we went. But very quiet. Just note that although it is titled "Plaza Catalunya" it is a ten minute walk from there (just beyond Urquinaona). But it was so easy - we took the AeroBus from the airport to Plaza Catalunya and then walked; going home there was a luggage locker place just off the Plaza where our bags could stay all day until time for the AeroBus back to the airport. The AeroBus was about 10 euros round trip per person; the locker for 1 large and 4 small suitcases was 14 euros.
The place itself was very clean and nice. The center room has a small kitchen (that has everything you might need) overlooking the living room, which opens onto a small balcony with a table and chairs. Although the view was just of the back of another building, there was enough distance that light shone in beautifully. To the left is the master bedroom and large bathroom. To the right were two bedrooms with a bathroom inbetween. One bedroom had a queen bed, and the other had two twins. It was perfect for me, my son and daughter-in-law, and my two grandchildren. The elevator made it great for me to come "home" and take a nap anytime, and then go out again to meet the family.
All in all, a perfect place for our family vacation!