It's one of the best places I've stayed at so far. It's very nice and clean, stuff is friendly and helpful and they speak very good english.
Overall the atmosphere was amazing and there's also a lot of effort put into decorating and cozyness. There's an amazing pub at the hostel where you can get breakfast and drinks and in the evening it turnes into party place. I had lots of fun, and the important thing is that you can't hear music or party noises in your room, so i slept pretty well :)
I'll definitely stay there next time i visit Copenhagen for all of the aforementioned things and also for amazing Chai Latte that they serve at the bar ;)