Xavi's place is, by far, the BEST PLACE TO STAY in Barcelona. The house is INCREDIBLE beautiful, you can see in the pictures that the house is clean, and stylish, but once you're inside it's AWESOME.
The house as a fully equiped kitchen, my girlfriend is a pastry chef, and she found everything to make me some awesome cakes :), the living rooms is spacious and VERY luminous, with a super comfy coach where I spent some afternoons taking a nap :). The main room is also super comfortable, but who wants to be on the room with those two AMAZING terraces!
The house even has a very luminous office where I spent the day working (he has a high-speed connection, so internet is not a problem).
Besides the amazing house, Xavi is the best host I ever had. He gave us lots of useful tips to where we should go on the neighborhood, and we go out with him to have lunch twice! I will miss Xavi more than his house.
You shouldn't hesitate, I stayed in Barcelona lots of times, and this were, by far, the best experience I had. This house should be an Airbnb Plus House!