We just came back from a trip which included Barcelona, Spain.
Our family (4 adults) stayed in Mariana and Ramon's AirBNB. The place was very comfortable for us and had everything we needed for our 4 night stay.
The location was great, very central and walkable to a lot of the attractions that you will want to visit. There were also great cafes and restaurants nearby.
Both Ramon and Mariana were very responsive and friendly hosts.
I highly recommend this home for your visit to Barcelona.