Silvia was extremely helpful as a host both prior to arrival (including detailed information on how to get to the house from the airport) and during our stay. We didn't get to meet her in person as she was on holiday when we arrived but her lovely friend Helena met us and helped us settle in and feel at home.
As for the apartment, it is absolutely lovely with plenty of space and light and everything the two of us needed to feel comfortable. We have been traveling Europe for some months now and we have stayed in some nice homes through Airbnb but of the ~15 we have stayed in so far this was honestly the nicest yet.
Location wise Poble Sec was a good place to be based and the Metro was only a short walk away with some interesting food options nearby. It was also easy enough to walk to Las Rumblas and other more tourist focused areas when we felt like more of a walk. What was also great about this area was that the airport shuttle bus's first stop is not far away making it easy to arrive to and then when we left it was only a short Metro ride to Sants Estacio to take a train onto other parts of Spain.
Overall this was a really great place and we would definitely stay here again.