The apartment was just what we needed for our trip to Barcelona, and Carlos was a gracious and responsive host. I appreciated the memory foam mattress and pillows in our bedroom, and the blackout curtains throughout the apartment. The location is perfect, near tons of bars, restaurants, and shopping. The view from the balcony is stunning and was a great place to enjoy a meal or a drink. The washer/dryer also came in handy for us.
You will probably hear some street noise from the master bedroom (which faces out on to the street), and my friends mentioned some noise from others in the the apartment building and construction. I would recommend bringing ear plugs just in case.