Basically it is very nice.
If you pay 5 euros, they can keep your luggage in the safety box and you can relax in the restaurant area or in the garden even before check-in time.
But the problem can be the card key.
We can use it for the electricity of the room.
You insert this card and your room will gain the power.
But imagine, if you stay with other strangers in the dormitory room, each schedule is different.
So while you take shower, the one who has inserted his card left the room (of course, with his card, without it, he cannot enter the room), all of the light just goes off. You are left alone in the black shower room.
I think that it might be for the environment, but it is too useless.........other than that this hostel seems perfect, so it's pity....!