Awesome!!!!!
This hostel´s single room was more like hotel than hostel.
It was so clean and tidy. They cleaned up my room everyday. (even if they don´t need to do that) The toilet, shower booth and sink in my room was perfectly clean. Of couse, no bedbugs. Bed, pillow, and bed sheet was clean and cozy. Breakfast is not included, but it worth to eat :)
It´s 5 to 10 minutes on foot from potsdamer plats.
Metro station (S/U Bahn)is near the hostel.
And most important, reception is 24h!
One problem is the window! There´s ladders outside the window because the hostel is remodeling it´s outer wall. So that made me worried about the security thing.. Buuuut, it was totally safe, you know, I was just scared because I was alone in the room ;)