The experience was fantastic! The hosts were very welcoming and explained the city in addition to the flat - they were able to refer us to a taxi service, and had a handy tablet for planning our days. The welcome breakfast provided was a great touch! They also left a phone to allow us to get in contact with them quickly via WhatsApp, to which they were very responsive.
The area itself is great, 5mins from the Metro (if that) and great views of the Sagrada at night from the bedroom window or terrace. Be aware the bedroom ceiling is a bit short, but we loved it... we had a great time here and will recommend to our friends in future!