The apartment was very well-located (check out Aga's list of places nearby), clean, and had everything we needed, e.g. heating, warm shower, fast WIFI, etc. The orthopaedic mattress was especially great for a good night's rest after a wonderful day in Barcelona.

Aga is without a doubt one of the best airbnb hosts we have met so far. She tries her best to accommodate on the check-in and check-out timings, takes time to explain everything clearly (e.g. how to get to the different attractions, must-see places, where to eat, how the facilities work, etc.), and is very quick to reply to any queries - we had some issue with the shower initially and she agreed to come and have a look without any hesitation (BTW, the shower worked out well in the end). Aga also went out of her way to help us retrieve our tickets for an FCB game and we were really impressed by her generosity. We'd definitely recommend Aga and her apartment to anyone who is visiting Barcelona and hope to be back there some day. =)

Tip: If it is convenient for you and/or your family, consider going around Barcelona on a rented bicycle! It will be really fun and you don't tire as easily compared to walking. Enjoy!