We enjoyed our stay at this apartment very much. The location was near ideal for us... Comfortable walking distance to 90% of what we wanted to see, yet removed from the center of tourist activity. We walked to La Sagrada Familia, Las Ramblas, and various sites in old Barcelona. The only places for which we used public transportation were Parc Guell, the train station (though you could walk there if you're not weighs down with luggage), and the airport.
The apartment itself s very up to date and modern. the four of us appreciated the two bedrooms and two baths. We also used th washer and dryer... But not the dishwasher. Our hosts spoke very little English but greeted us and were helpful with orientation. The place is very well stocked with plates, glasses silverware, bottle openers, etc. etc.
On the second night, our key to the main door from the street failed to work. We did not have a phone, but rang another apartment's bell and, luckily, a nice young man came down and let us in. Later, Attilio (I believe it was) responded to our email of concern by coming over and discussing the problem. He said the problem was with the lock on the main door, not with the key and that they would have another made. A bit confusing, because our other key worked (we had two sets) and other tenants' keys worked. We weren't provided a replacement, so we had just the one working key during our stay. Not really a big deal for our situation. I didn't hear an apology, though, from Attilio... I found that a bit disappointing...
The two balconies were neat to have... but be aware they are extremely shallow - not the kind with room for a chair... Beds were comfortable. Street noise was a nonissue since the bedrooms were at the rear.
I appreciated that our hosts allowed us to pack up and leave our bags inside the apartment for several hours after checkout time on our last day... allowing the young cleaning woman to begin her work while we were able to come back at 4 to pick our things up. This was very helpful.
All in all, we were very pleased with the apartment and would stay there again when returning to Barcelona...