Dolors & Enric's place is a great home for a couple exploring Barcelona. Although it's a little further away from the center of the city, it's still very close to Sagrada Familia (probably about 15 minute walk) and the Gracia neighbourhood which is well worth exploring. With Alfons X just a few minutes walk away, however, you can be at Placa Catalunya in around 10 minutes.
Highly recommended - would stay here again!