We were happy with our stay.

Location: 850m to park Guell and 850m to Sagrada familia. Location is off the main track but close to metro (300m to either AlphonsoX or Joanic - both on L4 metro Line).
Communication: Communication with the host was great - quick turn around and full support. One could not get a better host from that perspective.

For others to consider:
There is a market directly under the app (apartment is on the 3rd floor) - it is loud in the morning when things get setup.

Overall we were happy with the stay.