Stayed here for a few days and over impression is pretty good except for a few set backs in rules and initial hospitality.
Every hotel/hostel is pretty much the same Check-In is at 2pm, Central Hostel is at 3pm. Damn, that's pretty late especially if your flight lands at 9am. You're welcome to sit and order something in front of the receptionist area and wait but there's nothing to do there except watch Germany news, use your laptop or eat a snack. There's a chess board if you can find a partner to play with. The other room was where I rested a bit closing my eyes after a long flight. The room has an okay five story skyline view and a Foosball table. I was in there less than 15 minutes with no one else around and was told to leave, can't rest in there. Stupid rule number one has just been explained because one of your paying guest is not allowed to rest 15 minutes because his flight landed 6 hours early than Check-In time. At least luggage was allowed to be put in a room. 5 hours later and I am back to find the cost of Check-In linen cost an extra 3 Euros, though I didn't see everyone with that purple linen which is written as every five days must be washed and 3 Euros be paid again.
I dealt with two main staff: a very friendly and very hospitable/informative older German lady who spoke English well and was sweet as can be. I also dealt with a older gentleman that was very respectable and friendly host. So, staff are great!
The pros of this hostel is that it is clean, pretty new fixtures, nothing run down, well kept with garbage removal and toilet paper, all other amenities void due hostel-basic catering to guest-understandable. There's a Rossman downstairs to get your hygienic supplies (in the morning or afternoon) if one didn't bring it with them. The hostel provides a card for 10 Euros (you get your money back on Check-Out) and yes you can come in anytime of the night but Check-In rules past a certain hour you must call them and deal with reception. Security with the locks and security cameras are good but not 100% from strangers coming in. There are lockers for couple Euros a night.
Wifi is free but only for cell or laptop, not both, it has a strong connection. And there's a good handful of power outlets in each room as to provide each person (remember you're bunking with other people) the ability to charge their electronic devices.
There are multiple clean bathrooms separating the men and women showers. Hot water is good but the shower head stays in place and can't be moved much. Again no amenities due to affordable hostile. I know you can pay to rent a hair dryer.
Extra Note: No eating in rooms, bring air freshener (damn people don't believe in the clean air act of respecting other people's breathing), read the list of rules...host didn't like I had a little electrical heater in the room (of course for electrical safety reasons) - not sure how he knew. But other than a few rules, this is a nice hostel to stay in. read more