We stayed here for our honeymoon in late June, early July of 2017. We would highly recommend her place for this application.
The pictures perfectly represent the flat. As you can see, the terrace is very large. The couch out there is super comfy for relaxing, the table fun for snacks and drinks, the lounger for getting some sun.
Be aware that the inside is small (again, as represented in the pictures). The kitchen/living room are one little space, the bathroom and shower are tight. But for us it was all about a terrace and a decent size bed in a good location, and this place has those things!
The neighborhood and location are excellent, we felt very safe. There is a great restaurant, La Foga, right at the corner below; I recommend walks to shop and dine in El Born, visiting Santa Caterina Market multiple times, walk to excellent restaurants in Eixample along Rambla de Catalunya or Passieg de Gracia, even walk to the beach if you're up for a 40 min walk (we did - it wasn't bad!)
We would stay here again! That terrace is everything!