Joanna's apartment was exactly what we were looking for during our stay in Barcelona, was far nicer than I could've ever hoped, and made my work trip an absolute breeze.
She was out of town and unable to personally check us in, but she arranged for a taxi from the airport, had a friend let us into the building, and was incredibly responsive through the 5 weeks(!) that we were staying in Barcelona. The apartment was located in the heart of the old town (aka near lots of bars/restaurants), but perfectly situated on a small side street so it was almost always quiet and peaceful at night. Everything in the apartment was in perfect condition, and having a washer/dryer in the kitchen made our long-term stay much more comfortable.
On more than one occasion she answered questions almost immediately, and went as far as to provide a list of her favorite bars and restaurants in the area from when she was living there (several of which we ended up frequenting! And as if all of this wasn't enough, I accidentally booked our stay one night short of when our flight was supposed to leave, and she helped coordinate with the guests coming the following day and cleaning agency so we could stay one an additional our 9am flight the next day.