Plus: It has an excellent public area for dining, cooking and chilled out. Its cleanliness is simply beyond question.
Minus: Unlike other hostels, keeping luggage is not a free service. In my case, if I need to leave luggage there for 8 - 24 hours, then the charge would be 9 - 13 Euros! So at the end I chose to drop off my luggage after check out in the nearby train station, where I would only need to pay 5.5 Euros.