We booked this appartment because it had WIFI, two bathrooms and two separate bedrooms for the children (aged 11 and 13) as well as a double en suite bedroom. We were pleasantly surprised on arrival that the second toilet was in fact a second shower room. Appartment gave us more space than a hotel would have done.
You could cook here if you wanted although there are many small cafes and bakeries open all hours in the surrounding area. If you like good food, I can highly recommend the "Restaurante La Pepita" Carrer de Còrsega, 343 just 10 minutes walk from this appartment. Go before 8pm though after which a queue develops.
Appt is ideally situated for the main tourist attractions. We travelled exclusively on the T10 zone 1 travel card for 9.95 Euros (google it) which extends to El Prat airport. Bought 4 in total which is very economic and better value than a multi-day pass. Amazing the journey from the airport cost us just 2E each on this card. Where else can you do that in Europe - well done Barcelona public transport! We walked a lot as well.
The procedure for picking up the keys was self service via a safe-box but easily reached on the underground. As a consequence we made sure we travelled light with luggage we could carry comfortably for 10+ minutes.
None of us spoke Spanish or Catalan but we managed with sign-language, many multi-language menus. We found the locals to be very accommodating and helpful - apart from the young girl who nicked a journey off our T10 card by scooting through the turnstiles when we (as northern Europeans) went left instead of right. Hey ho, these things happen and it only cost us 1E.