There are good and bad things that are host dependent and host independent.
The good things host independent: the location- you would need to stay inside the Sagrada to be any closer to it. I don't particularly like the area, but it is nice. Two bedrooms, good for 4 people.
The good things that are host dependent: the apartment is recently renovated. The windows provide good isolation from the street noise.
Bad things that are host independent: the metro noise is just awful. You can hear the metro below, which shakes the bedroom walls, and is just unpleasant. The hallwayis small, and it is difficult to get to the apartment using the stairs - no elevator available. The rooms are really small, don't be fooled by the photos.
Baf things that are host dependent: you pay the price of an expensive hotel room, but they don't provide anything in the apartment except towels. No soap, no shower gel, no coffee, no garbage bags. We had to buy everything ourselves.
Overall, not worth it.