Gianluca's apartment is RIGHT next door to la boqueria and around the corner from la Rambla. It's super easy to hop on the train from here and get anywhere else in the city. Additionally, if you walk all the way down la Rambla, you end up at the beach!
It was quite loud outside at night - I don't think Barcelona sleeps at all. We used earplugs and it was totally fine! Worth the noise at night to be in the center of everything else!