Being in a homestay often means living on the farther reaches of the city.The center of Barcelona is focused on a port. If you walk away from the port towards the mountains, you will find the most dense area of Barcelona. From the tiny winding streets of the Gothic district to La Rambla and El Raval, there are tourists and citizens filling the streets. But go a bit further towards the river called Llobregat, and you'll find, still in city blocks, a much calmer area of town. The innocent rows of three and four story buildings make up a Spanish equivalent of suburbs.
In all, it is a peaceful place to live, less than three blocks to the nearest Metro stop, less than a block from the nearest coffee shop, and tucked away from any large street that would bring night noise. It is amazing to me to be able to live so close to everything, but still have a quiet home. This is again in the construction of the buildings. Spanish apartments are generally laid with bricks, whereas American homes are made of wood. Hmmm, I guess the story of the three pigs and the wolf may be true, if the wolf's howl is what worries you.