Our family of 5 (with our 17, 18 and 20 year old) really enjoyed our 5 day trip to Barcelona and staying in the Poble Sec area was ideal for us. We found great economical/popular eating places 5 minutes from the front door (Carrer de Blai/Placa des Sortidor). Montjuic was easily accesed (again only 5 minutes walk) directly up the street from the apartment and we thoroughly enjoyed the views/birdlife/the botanic garden/a trip on the cable to the castle on top. We all really enjoyed the spectacle of the light/music show at the Magic Fountain on the Placa de les Cascades (a 15 minute walk away). Exploring further afield was also very easy with access to the Metro 5-10 minutes walk away, La Rambla and the sea front only 15-20 minutes walk away.
This was a great place to explore from and we would definitely recommend a stay and would happily return to Carrer d'Elkano 22.