We have 3 children ages 14,11 and 10 and there was plenty of space for us all.
Ignore the bad comments, it is how it looks it the pictures, the references to it being dated may refer to the entrance or stairway/lift but it’s only cosmetic.
The apartment was comfortable and stocked with everything that was needed for our stay.
There is a supermarket opposite and plenty of other shops nearby, our daughter is coeliac and we were able to cater for her.
It is walking distance to the beach, Sagridia Familia and many other sites.
We enjoyed our stay in Barcelona