Xavier is a great host. His offer to pick me up from the airport was really helpful. Cheaper than taking a taxi, and easier than public transit after a long trip. He has a really nice flat in a quiet, fun neighborhood. Poble Sec isn't quite in the heart of all the BCN action, but it feels like a more authentic neighborhood, and it's really easy to access everything.
I'm pretty picky, and I'll say Xavier's shower had excellent water pressure, and the bed was really comfortable. The building is charming. I had a delightful experience.