If you're a backpacker looking for an inexpensive place and want to meet nice people from all over the world, go for it.

But: checking in and out was not a good experience. The place is connected to a coffee shop and if you arrive or leave during off-hours there can be problems.
Your ID gets collected in exchange for the key card and there is no one available to give it back to you at night or early in the morning so you have to think ahead and make an arrangement with the host beforehand.

Also, when closed, there is no sign that you are standing in front of the hostel and no hint to the opening hours.