For the most part, the place was great in that it was a large space and clean. It was located in a decent part of town relatively close to two train stations.
If you are a solo traveler, know that it's closer to a 10 min walk and at night, and smarter to get off at Plaça de Sants, as opposed to Mercat Nou so youre not walking in a dimmer residential area.
If you are a light sleeper, DEFINITELY reconsider. Where the room is situated, you hear EVERYTHING in the upstairs neighbor unit, as clear as a pin dropping at night. I was up until about 3-6am my entire stay, only getting about 3 hours of sleep a night. Not from pin droppings, but yelling and parties and constant movement around the apartment. After speaking w Air BnB on day four, I was told Sebastian would not refund any part of the reservation if I left. With only two days left of my stay, I agreed not to leave if he spoke to the neighbors, in hopes of getting one good night's sleep. That did not happen either. It was a shame, bc I felt by the end, my first trip to Barcelona had been an exhausting disappointment. Some people do fine w ear plugs. If that's you, then I suggest packing them for the stay.
There were other issues like ants and a couple water leaks, but the response I got from him each time was very defensive and was blamed on someone else, much like with any other issue (you might even witness it in response to this review).
I am also a host, and found it a little disappointing that he felt the need to put blame on so many things/persons, other than just owning and solving the problem.
I know there are several great reviews, and I'm not coming from a place of bitterness. Just want others to be aware of the experience and wish I'd known about a couple things upfront.