It was really easy to find the flat from the brilliant directions given. The flat was good - but really noisy outside, as it's right on a big main road (with major roadworks going on at the moment too). So if you want to sleep you will need to buy some earplugs!
Great area, perfect for the park at Montjuic, and for walking easily into the main parts of town. Good little bars all around the flat, and shops too. A good place to stay.