I stayed here for five weeks and I absolutely loved it. The location of the apartment is in the heart of Born, with so many wonderful restaurants and shops only a few steps away.
The rooftop terrace is absolutely amazing. You can see the Catedral of Barcelona and the amusement park of Tibidabo from there. Also amazingly sunny and lovely to have a peek at the street below you.
Although Born can be a lively neighbourhood I had no trouble sleeping. I experienced no major noise disturbance whatsoever.
The apartment itself is also great for a long stay. Everything was clean upon arrival, the bed was good, I had enough room to store my items, kitchen is well-equipped etc. Shower wasn't working properly when I arrived but the host immediately fixed it, so no problem at all.
I would definitely recommend this apartment!