The balconies are private and incredible; one was quite large and the other had a stunning view of Sagrada Família.
We personally didn’t find the bed pillows too comfortable, but the bed was good. Most people would probably find no complaints.
If you are sensitive to noise at night, take note, as the elevator is quite loud (the mechanism is directly beside the unit), and the metro rumbles beneath the building as well. Bring earplugs :) We got used to it after a while.
The location was close to pretty much everything we wanted to see, and Lola met us there when we arrived, giving us great tips on what is close, how to use the metro (and get the best value), and other useful tips.