The apartment is on the 5th floor (which is actually 8 floors up) but has a small elevator which works well unless you are a large group as it has a weight capacity easily reached.
The neighborhood is family friendly but the building can be quite noisy at night.
The location is excellent - 10 minute walk to La Ramblas, 10 minute walk to the waterfront, 10 minute walk to the base of Montjuïc & a 2 minute walk to multiple transit stops (Metro and bus). Plenty of decent restaurants nearby, including de Blai where we found good tapas and (most importantly to our kids!) great Nutella crepes. Basic groceries available nearby, and a bakery right next to the apartment building.