My experience was different from most of the reviews here.
The apartment was comfortable and overall clean, but it needed some maintenance. Some of the walls were dirty and had chipped paint. There was low water pressure in the shower and since it's open, there was water all over the floor after a shower. The air conditioning was too weak and couldn't cool the entire apartment comfortably during the day.
Though the biggest issue for me was the barely functioning WiFi. The speed was OK when it worked, but the signal was weak on both 2.4 and 5GHz frequencies, and it kept disconnecting every few minutes. Very frustrating and watching any streaming video was impossible.
On the plus side, the location is excellent if the beach is your main destination. It's very well connected and there are many shops, bars, restaurants and a supermarket very close by.
For the price there are much better places to stay in Poblenou.