We spent a month in this airbnb, and it is by far the best I have done in terms of accommodation quality!
We were 4 and we didn't step on each other, as there are 3 bathrooms and 4 bedrooms. The decoration is minimalist, very uncluttered, it's really nice to live in such a place. There is even a common terrace where we used to do our sport every morning. Alejandro is very attentive and knows how to make himself available if there is a problem.
The only drawback is that it is a bit far from the ramblas and the beach (20min by metro I would say), but Barcelona being a very spread out city, it is obvious that we can't be everywhere.
Thanks Alejandro!