My friend and I had a fabulous time staying with Simon and Roxy! Our luggage was lost and so we were running late. They were super flexible and very personable. We stayed with them for 3 nights. They took us out to a couple of places for food and drinks and make recommendations for food places and sites to visit.
Their location is super convenient to get pretty much anywhere via metro.
I highly recommend staying with them so much that I'm passing their Airbnb info to a couple of friends who will be to Barcelona in a couple of months and then next year. :)