My wife and I loved staying in Jordi's apartment. The location was convenient to the neighborhood square, shops, restaurants and a short subway ride from the main attractions of Barcelona. The neighborhood, Gracia, is warm and friendly and, though removed from the bustle of the tourist center, still has plenty of places to eat and relax.
If you plan to cook, the kitchen may take a little getting used to, it's a little small and the stove and oven weren't immediately intuitive (to an American). That said, I figured out and ended up cooking dinner four or five times in the two weeks that we visited, shopping at the local markets (just blocks away).
One feature that we especially liked that never gets mentioned is the water pressure. It was perfect. Often when traveling, we have to deal with water that dribbles out or is only warm for a few minutes, that wasn't remotely a problem here. The shower felt as good or better than home.
As others have mentioned, there can be some noise from the street out front, but you can't hear it so much from the bedrooms in the back.
Finally, I want to thank Jordi for being so accessible and helpful. We had some difficulties on arrival and departure and Jordi went above and beyond in being there to assist us. It's much appreciated. I would highly recommend this apartment and Jordi as a host.