It was truly great. The apartment itself was just fantastic, plenty of room for the five of us. It was clean, well equipped and really attractive - very true to the photos.
A small issue is that noise travels very easily because of the tiled floors etc but we had good neighbours and while we could hear them talking etc there was nothing excessive. (The complaints were mainly from my sons complaining that they could hear my youngest snoring!)
The location was really good. Easy walking distance of La Sagrada Familia and also Las Ramblas and the Port but there is also a metro stop right outside the door which was helpful at the end of a long day.
Check in was extremely straight forward and communication before and during our stay was great. We requested some additional bedding and that was delivered the next day.
Would thoroughly recommend this apartment to anyone visiting Barcelona.