Great place to stay in Barcelona! A short walk 10-15 minutes to many of the places you want to visit including great restaurants as well as La Boqueria. A short cab ride to most other places (Park Guell, Sagrada Familia, etc.) as well.
Cristina was a awesome host, very communicative and helpful. We traveled with an infant and she provided a lot of amenities to help make our baby comfortable (i.e. crib, toys, ability to blackout the master bedroom of light, etc.).
I know there was complaint around noise and while this area may be a bit noisy for anyone who doesn't live in a bustling city, I didn't thing it was that bad. However, I would recommend a white noise machine (or an app on your phone) if you're accustomed to sleeping in silence.
Stay here without hesitation!