This is the perfect place to stay in Barcelona. You're close to all great spots in the city and even if not there is the metro, buses and even touristic bus just steps from the door.
Lots of shops and activities around.
The appartement is comfortable, well decorated and really big for 4 people like we were.
Didn't met Martha but David was very nice and helpful, explained us all we the things we had to know, and gives us additionnal details like the huge supermarket on the basement of Corte Ingles just aside in the Plaça Catalunya.
We had everything we need.