The biggest USP of this listing is the host Elena herself. Ours was a late night check-in which was beyond the hours mentioned by her, but she was very accommodating and not only allowed us in late but also stayed up and helped us on our arrival.
She was very nice and cheerful and explained at length the different things available to us and the options we had around to explore the city. She understood our plan and constraints and made a few good suggestions.
But the best part about her is the amount of thought she has put into the little details. The apartment was lovely and smelled great at all times. Elena has everything you can possibly imagine you'd need and she still would go out of her way to make it possible for you if she can.
She made sure we felt at ease at all times and she was available to answer all our questions and even helped us out by booking a cab for airport even when we got delayed with a smile.
All in all, it's her place I will be going back to whenever I go to Barcelona next. :)