Maybe it was just bad luck but the AC of my room was not working and the portable one they put was not enough for the 30°C of summer nights in Barcelona.
besides that, the hostel was good enough, the wifi worked well; the kitchen was good too with microwave, toaster, water boiler; they offered a light breakfast ( cereal, coffee, magdalenas) the bathroom was clean, there was a living room with tv and a terrace. The service was alzo good.