Great appartment in great location (just 3 min walk to Sagrada Familia). Easy to travel from metro station close to Sagrada Familia. The quarter is ful of restaurants and/or supermarkets. The appartment is well equiped with kitchen/laundry utilities, so easy to make food on your own if one needs to stay on budget :)
The windows are not very good at blocking noise from the street though. It might be an issue to noise sensitive person.
I highly recommend this place during your stay in Barcelona.