When you have to choose a property for a long stay as I had to, trusting the owner is essential. I've stayed in this apartment for 32 days and I can say that Sofia was very helpful and trustworthy.
The apartment is clean and everything is in really good care. Someone could say that all the furniture is brand new. The negative point is that it doesn't have a working air conditioning, so it might get really hot there.
It's not very central, but it's close to some famous points as Sagrada familia and Hospital Sant Pau and the subway station is in the same block. You can get anywhere using the metro. You might take around 35 minutes to get there by subway or a 8 euros taxi.