Marta and Paul's place is perfect. It was our first time in Barcelona arriving from Madrid. Marta was quick to answer and to accommodate our requests. The place is perfectly located away enough to avoid the noise of the city but close enough to everything. The metro is just a few blocks away. The metro will take you everywhere you will need. 2 stops to la rambla and the 3 to the beach. Just one block away there is a square that has live entertainment and delicious food.
But if you feel like staying in, the appartment is perfect since it is fully equipped with a modern kitchen. The flat also has a small backyard perfect to spend a wonderful afternoon enjoying dinner while the children play.
I recommend this place if you are traveling with kids and if you want to be able to sleep at night.