I had to fill out an application upon arrival work my personal information. Which I thought was repetitive seeing how I did that online prior to arrival.
Also, if you have guest visiting you, they will ask for their identification to copy down, which I thought was a bit much. It's my first time in Berlin/Germany, if there's an issue with drug trafficking or prostitution, etc... I wouldn't know. Nor was that ever explained to me. The front desk lady just rudely ask to copy his ID or else he isn't getting in (even though I came down to walk him up).
Also when you leave the building, you have to leave your key at the front desk. Yesterday evening, when I returned, there was a new man working front desk who I haven't seen before. I told him my room number and he just gave me the key to go up. I find it interesting how it was a hassle for my friend to visit me, yet another employee just gave me the key without properly identifying me. Either someone's not doing enough... Or someone's doing too much.
Other than that, it was clean. Good price and good location.
I wouldn't pay for the breakfast though.