Three of us spent two nights here. It is lovely apartment in beautiful historic building. Metro (always overcrowded) is very close - 3 mins walk (if it takes you longer, you are using the incorrect exit from metro). Shops (of any kind - grocery, pharmacy, bistros..) are just next door.. perfect location for exploring Berlin.
Be aware of paper-thin walls - if radio plays little louder, it can be heard in other apartments and vice-versa.
Also, make sure to confirm the check-in time so that you do not have to wait.