We spent a whole month on a workation at Guillaume's apartment in El Raval.
The location is super central you can reach both the nearby areas and some key transport junctions on foot in minutes. The flat has a small separable room that can be used either as an additional bedroom or (as we did) as a study. The kitchen is well equipped for basic everyday cooking.
Guillaume was extremely friendly and responsive. When we arrived he took us on a short walk to show us around in the neighborhood and whenever we had a question he was quick to respond. There were only a few tiny things we had to contact him for throughout the month which inevitably come up during a long stay.
What we felt made our stay less than perfect was the not so comfortable couch and the neighborhood. The couch is a convertible sofa that can be used as two beds, which is convenient but sitting on it as a sofa is not the best for long hours.
The neighbourhood, El Raval, had a bad history but it is definitely better these days. However, the surrounding streets are still very dirty, noisy, smelly and run down. From the areas we visited in Barcelona it was the least developed and thus for some people it might be a bit uncomfortable to walk home on these streets every day.