We enjoyed our stay in the apartment. The location was excellent. Walkable to shopping and amenities with a Metro Station a few meters away. la Ramblas is just a few minutes walk and we were about 20 minutes on foot to Barceloneta. There is a mini-market across the street and a Mercadona grocery about two blocks away. If coming from the airport by bus, the airport buses stop just a block away at Plaça Catalunya. There are two good local bars/restaurants just below on the street and coffee shops nearby. The interior had everything we needed for our trip and the bed was very comfortable. Everything was in working order. Stéphane explained everything clearly when we checked in. He even texted us to let us know the apartment was nearly ready and we could check in.
The only thing I should mention is that you are right on top of the metro and can hear the rumble of the trains. It didn't bother me at all. When I come to Barcelona again, I will definitely consider this apartment.