We were mainly looking for a base with a comfortable bed, at a great location, and Sonia delivered. Sonia was polite and helpful, and she always responded in a timely fashion.
The apartment isn't big, but it has everything we needed, and it was very fairly priced. Situated a short walk from both the Born district, the Grácia district and La Sagrada Familia, we were able to stroll everywhere we wanted. If we needed to move a bit further, the metro and train station is just around the corner, also it is very easy to rent bikes everywhere.
This is simply put: A great place, at a great spot and Sonia is a great host, that I very much recommend.