The place is amazing, me and my girlfriend fell in love with it on AirBnB and found it even better in reality!
Unfortunately we didn't get a chance to meet John, but his friend was there to show us around the place and told us to make ourselves feel at home, which we did.
The place is very convenient and located right above a supermarket, and really not too far from anything really.
If you get a chance to book this place, do it and look forward to an amazing stay in Barcelona!