We enjoyed Javier's place even more than we anticipated. Its location on a beautiful square just north of the Eixample gives you a slice of local life that will be memorable. Do take the time to watch how it changes throughout the day, as it serves as the living room for all the families residing in the adjacent buildings. We totally agree with other reviews about the various restaurants and bars around the square.
The apt was clean and Javier's assistant was waiting there to explain the appliances. We especially appreciated the double-pane windows which did an amazing job of sound-proofing. There was plenty of storage for clothes and the shower had good pressure along with endless hot water. Our son enjoyed cooking breakfast as the kitchen had all of the utensils he needed. The wifi generally worked well. As others have mentioned, the upper stairs were very narrow but only noticeable when carrying luggage. The air conditioning was sometimes noisy but it beat the alternative.
Javier was superb with communications, including arranging our taxis to and from the airport. We will be returning!