Wi-Fi was really bad, even during the day when no one else was in the hostel. Television in common room had no sound (not a big issue, though, I just wanted background noise while I was writing post cards). Lockers tall, but skiny - may make it hard for backpackers to get their stuff in the locker. It's 5 euro to wash and 5 euro to dry, and they only have one washer and dryer, and if the hostel is washing sheets, you may have to wait. Truthfully, though, all of those are small things, and did not affect my rating at all.
I cannot think of enough good things to say! The location is right in the middle of the old town, right on the river, so pretty much everything a tourist would want to see is right there. The price is amazing, the cheapest I paid my entire trip in Europe. Kitchen is quite a good size, but with as cheap as restaraunts are in Ljublijana, I never bothered to cook. My room overlooked an old city street on which cars are forbidden, so it was really nice to sleep with the window open and just listening to people talking way down in the street below. Nice common area. Baggage storage. Wonderful staff. Laundry facilities