Raquel & Marcos's apartment is located on the quiet street so you will have a good night sleep but very close to the metro station and all the attractions (it won't take you more than 10-20 minutes to reach any of them, 5 minutes to Sagrada Familia).
Apartment itself was nice and clean and very comfortable for 6 people: 2 couples and 2 kids or single grown ups.
There were couple grocery stores and tapas bars around the apartment. We found recommendations for one of them in the folder left by our host and it was great. I definitely recommend this apartment!