We have had a beautiful stay at Pere's apartment and while being in a residential area of Barcelona it was only a few minutes walk to Avenida Diagonal, which means you can either walk to many places including the Sagrada Familia which is about 30mins walk or go on the hop on hop off buses which we strongly recommend as you can see so much more of the beautiful city.
If you are looking for a good Spanish meal at a low cost you must visit Santa Anna restaurant, the staff couldn't have been more attentive, we had three fussy girls and they made something special for them, everything we had was delightful, it is in Santa Anna Street off Las Ramblas after you have crossed over from Placa de Catalunya.
The apartment had everything we needed for five of us, the beds were really comfortable, it was lovely sitting on the terrace for breakfast and a glass of wine at the end of the day, on the same Street there are some cafes to enjoy breakfast, small food shops where you can find a bit of everything and beautiful shoes and clothing shops!
We strongly recommend Pere's apartment and we will definitely go back.