I spent last week in Barcelona with my wife and my two eleven year old kids.
The apartment is really confortable, clean and the furniture quite new. You have all the appliances needed if you want to have lunch or dinner at home, something the we honestly didn't do but for breakfast, becouse we preferred to spend day and night outside. A washing machine is also present in a small box on the roof.
To reach the apartment at the third floor you have an elevator, very useful especially the day of the transfer.
The position is excellent: in a quiet block, but 15 minutes walk from Sagrada Familia and 5 and 10 minutes walk from two different subway stations. With the blue line you can easily reach Camp Nou or Park Gruel, with the yellow line you can reach Barceloneta or Passeig Gracia from where you can walk to the Rambla.
I especially reccomend the apartment especially to families who like to enjoy the city.
Thanks Monica and Carlos.