Javier's place exceeded our expectations even with all the great reviews. He waited for our arrival after a delayed flight and explained everything thoroughly after a warm welcome, including the parking garage, local and distant attractions, and info about the flat.
The provisions are some of the best I've seen with a stocked fridge, bathroom supplies, adapters, great WiFi and entertainment. Basically anything you could need.
The flat itself is very clean, spacious and welcoming. It isn't close to the centre but roughly 20 minutes on the metro can get you to most places.
The only thing to note is that the shower was a bit dodgy and can go cold quickly, but it was explained by Javier and despite that it was still completely adequate.
I wouldn't hesitate to stay here again, it made the trip to Barcelona much more enjoyable.