Great location for Poble Sec - right in the thick of it and on Av Paralel. Company hosting were contactable and key entry is safe (all good).
I would avoid if travelling as a family, as the noise is deafening from neighbours - not necessarily through music or anti-social noise, but simply the construction leaves you feeling every pin drop, footstep, laptop opening (!) etc. You could be much more comfortable elsewhere.
Plus, at this cost, you could definitely do better and find a better serviced building that might handle towels or bedding over a long stay... As a Air BnB evangelist, it’s tough to come to the conclusion that we would have been better off in a hotel but sadly, it’s the truth in this case. Great location though!