The appartment is situated 5mins walk from Parc Guell and 10mins from the metro line 4, Alfons X. Transportation around the city is superb. We used the Famillia metro ticket which gives you 8 journeys around zone 1 for only 10 euros!
The surrounding area has some great places to eat. I'd recommend Nou Sanllehy, right next door to 365 (Spain's version of Greggs but better!) where Alex and his father make the best croquettes in town!
The appartment is of a good size. Me, my wife and 6yr old had no trouble fitting in.
Can Baro is a very hilly and steep area, so that's something to bear in mind however, it affords great views over the city itself. Sagrada Familla is a 20 minute walk if you don't fancy the metro.
Laia is a supurb and responsive host. Somehow, I locked myself INSIDE the bathroom one morning and within half an hour, a locksmith was round and freed me.
All in all, we loved the city, the appartment and Barcelona. It has something to offer everybody of every age.
10/10. Would use Sergio and Laia again!