I loved staying in Augusto and his wife's home. I stayed in the apartment for several months (long-term booking). The apartment is overall very nice. The wifi is also really good. The two main bedrooms are very spacious and there is a small bedroom that we used as an office, but would be fine for a kid or someone who doesn't need much space.
The apartment has no noise from the roads (very rare for living in the city of BCN). The building itself is also very quiet, we rarely seen our neighbours. A little supermercat is at your doorstep too and the people that work there are super nice.
The location is amazing, I love this neighbourhood. It's very very close to la Sagrada Familia, with lots of nice restaurants on your doorstep. Very close to transport links (bus/metro).
Augusto and Montse were really nice to deal with. They seemed like really lovely people and would help out with anything you need.
The only potential drawback for some may be that the rooms don't get natural sun light. However, during the Summer in Barcelona, this might arguably be a huge plus! The apartment naturally stays much colder than the vast majority of places I've stayed in here. We rarely turned on the air conditioning unit and were comfortable with just using fans.
I would highly highly recommend staying at this home!