Great location just outside the main parts and spacious flat!
The Metro is 5min walk and we used the 10,20€ T10 pass. Most metro tips were 25min. Cafe shop around the corner as well as grocery market. Recommended by host is Blai street; tapas bars and dessert lines the street. I would definitely recommend going to international mass at La Sagrada Familia, Italian dinner at BelleBuòn, and taking a Paella and Sangria cooking class via TripAdvisor.
The flat: very spacious for four. We originally had six guests to go and the space still would have been spacious. Washer, dryer, and iron worked just fine. The terrace is wonderful. As for the ensuite bathroom, careful the shower leaks. We dried a towel several times to keep down when in use. Two of us found the beds comfortable and two did not. At night you can hear everything outside and from the neighbors so be prepared. The windows have closing shutters which was great to block out the sun and some noise.
Lovely time, and great hosts.