I have to agree with the last review before this one. La Casita owners, whom I met over the phone while I was staying there, think of their hostel as quiet because they don't have a television, a sound system, or a bar in their common area. They do, however, have a fridge, which guests can and do use to stock up on alcohol, and they do have a lovely inner courtyard, right outside the main dormitory.
I stayed there for 3 nights. Unfortunately I was dumb enough to pay for all 3 nights in advance, and they wouldn't refund my money when I wanted to leave early. The place was really loud, with guests smoking and drinking in the courtyard ALL NIGHT LONG... until 6am. I couldn't sleep at all, even with earplugs. Drunken guests were coming in and out of the dormitory all night long, knocking things over, talking, laughing & screeching as if they were at a beach party, getting into all states of undress (one girl was walking around topless, while another was in her underwear), and I was surrounded by people nearly having sex in the beds on either side of mine. I tried to sleep, but I couldn't.
I enjoy partying too, and I'm not a prude at all... I'm an artist with very liberal friends. But during those 3 days in Granada I was WORKING during the day. I chose La Casita because they advertise themselves as a quiet place where people can get a good night's sleep. BUT THIS IS NOT TRUE!!
The place also has a cat -- in case you're allergic. They never mention this to anyone at all when people sign in. I love cats, but I know people who would not have been okay there. I caught the cat sleeping on several different beds in the dormitory during the day.
The bathrooms felt yucky too... not filthy, but not clean either. They were the sort of bathrooms I would expect at a camping site... old, half-put-together, black spots everywhere from aged mold that simply won't come off, etc.