There is no staff overnight, so there is no one to ask the other guests to be quiet during the night. It can be pretty loud. I didn't get to sleep until around 5 a.m. because of the noise from other guests.
There is a shared kitchen. I was hesitant to put food on my shelf in the fridge because I thought maybe other guests might help themselves. Nope! The staff threw my food in the garbage. So, I had to go buy more food.
I stayed for three nights at another hostel just off of La Rambla in the tourist district of Barcelona. It was cheaper, quieter, had a private bathroom. More