This flat is in an amazing location in El Raval a minutes walk to Sant Antoni Market and in the opposite direction MACBA and Plaza Catalunya. We love El Raval, we lived there 4 years ago for several months and our son was born in Barcelona and lived his first weeks in El Raval. It is full of life and energy around every corner, very multi-cultural, and is a bit less touristy than some other parts of Ciutat Vella. But the neighbourhood is not for everyone so do your research first.
The flat itself is comfortable and has character. As an airbnb host myself, I would say however the place is obviously run by a company that probably owns many vacation rentals in Barcelona. Therefore it might be missing some of the personal touches you'd find when someone rents out their own house on airbnb. But that is the reality of Barcelona, this place has probably been rented out to hundreds if not thousands of tourists and shows more wear and tear than is visible in the pictures. This was not a real problem for us, and should not deter everyone from considering renting the place. It offers good value and opportunity to live in a real Barcelona neighbourhood.
Only other critique I would make is there could have been more attention to detail in the cleaning. At first glance things look clean, but then you notice the fans are covered in dust, the mirror in the hall hadn't been wiped down. Coffee machine was really unusable and should probably be replaced. Again I think the owners are unaware of these kinds of things because as I said I suspect they manage many apartments in the city. SO they aim more for quantity than quality in their business model. That being said I would still stay here again. And very happily if they addressed the few issues.