This is a wonderful apartment and perfectly located. You can easily walk to most of the major sites of Barcelona. It is easy to get to by taxi. Plus, it is just a 5 minute walk to Plaça Catalunya where you can catch the Aerobus to and from the airport.
Anna was very responsive. She met me upon arrival and explained all of the various things in the apartment. She also gave me a few suggestions for restaurants, etc. When I would email her with questions or needs, her responses were always immediate.
If you are simply doing the "tourist" thing for a week or so, the apartment can't be beat. I stayed for a month to do more than just sightsee. So, I ate in a fair amount of the time. My only complaint is that the kitchen could have been slightly better equipped. There was a moka pot (the small Italian-style pressure coffee pot) that makes only one cup at a time. If you prefer to have two cups of coffee in the morning or are a couple and would like to have your coffee at the same time, it's a problem. So, I went out and bought a French press for the apartment. I also ended up buying salt & pepper shakers as well.
Anyway, this is a very minor criticism. I would GLADLY stay in this apartment again if I ever return to Barcelona.