We had an absolutely lovely stay in Gabriela and Manuel's apartment. The location was great in terms of amenities, access to metro and ability to walk to a number of tourist attractions. The terrace is a great place to spend time. I will happily book this apartment the next time I travel to Barcelona.
The only drawback is there are no loungers on the terrace, we bought cheap yoga mats at a shop around the corner though and these were a fair substitute.