I have traveled a lot around the world and never complained anywhere, until now.
We were a group that booked two larger rooms with two separate beds. We only got one room with separate beds and a smaller room with a small double bed. Complained at reception but they said the room is of the same type. How can that be?
Eventually they agreed to give us a new room the next day. Then we got a small room with two beds, still not what we paid for. Also called Hotels.com which didn't help much either. The only thing they did was call the reception, only to be served the same lesson, that the rooms were correct!
The least they could do was give a heavy discount on one room. As I have not received the product I ordered!!!
So in all, our group had experience from three rooms, and with this I can also confirm: none of the rooms' ventilation/AC worked correctly. In one room they cannot be turned on, in others they blow hot.
The rooms facing La Rambla are very noisy, often throughout the night, which you can predict. But we were not prepared for the noise from the underground/Metro. Frequent 24 hours a day, the building shakes and we expected that the hotel would soon collapse into a large sinkhole. FYI: We stayed on the third floor.
Hotel has two lifts which are not reliable. They often stopped a few centimeters too low, which causes inattentive guests to stumble out of the lift.