We stayed two nights while in Barcelona. The apartment was self-contained, including a washing machine. There was one bedroom with ensuite bathroom, and a living room with a large sofa-bed. Both the bed and sofa-bed were very comfortable. The sofa-bed in particular was a pleasant surprise, as it was king size and had a thick mattress. Blackout roller blinds worked well.
The reception pointed out that we had to be quiet after 10pm due to residents being disturbed - so be wary if you plan a party!
The building has an underground car park, which is a little tricky to get in due to tight turns going down the ramp, but spaces were available and convenient to get to the rooms directly from the car park via lift. A smaller car is recommended for ease.
The area around is not great, with a lot of graffiti. A police station is right next door. But, a lidl is a few minutes walk away so great for groceries. The location is not great for walking but convenient for the airport and for getting to the motorway. We would stay again.