This apartment is managed by a company, not an individual owner, so the person you are in-contact with may change, as well as the person who meets you at the apartment.
All of the people I communicated with responded fast and the person who met us answered all our questions.
They accommodated us dropping off our bags early so we could go out for the day.
The location is excellent: the main streets that head down to the Gothic quarter are beautiful with some of the best architecture in the city (two Gaudi buildings), and just about every fashion retailer you can think of.
But you are also two blocks from the beginning of Gracia, which is a heavily local, Catalan neighbourhood that is a lot different from the rest of the modern (Eixample) district.
Within a 10 minute walk you have a lot of the city's best restaurants that range from old-school Catalan joints with Porrons on the table, high-end restaurants, and casual bars with ridiculously good pintxos.
The apartment was mostly well-maintained and clean, with some exceptions: crumbs and nail clippings on the kitchen table and chairs. And the kitchen chair legs had screws that were loose and even missing, so a few of them weren't really safe to sit on. The bathroom was also missing handsoap and there was only one roll of toilet paper (we were staying for 5 nights).
All-in-all it's a good value location, it just needs a little bit more attention to detail.