Where to start; worst problem is probably that the company advertises with it's central location and even mentions on Expedia that it's located in the Mitte district... Don't be fooled, it's not. It's a 15 minute walk to nowhere, though at nowhere you at least find a subway station. Still, the neighborhood itself is amazingly uninteresting and appalling, ie ugly and at night full of drunks on streetcorners.
Next up, the horrible, ill-making smell which for some reason comes from every possible bathroom in the hotel. It was explained as some summer-based problem with river water coming up (?!?); Still, summer was gone and the smell remained. Regardless, how could one accept any excuse??
Rooms only have double twins, which leaves me wondering: is there actually anyone aside from a bunch of students travelling together that rather sleep on a smallish twin bed??
Minibar is advertised as complimentary, though you are chargest for every refill (last time I checked, that was not the definition of free). Breakfast is so expensive, you might expect caviar and champagne. While the selection is definitely decent, it in no way compares to the outrageous prices. In general, food appears to come at a price which is quadruple it's value.
Staff is mostly uncompetent, albeit somet are somewhat friendly. However, the front office manager is probably the most unfriendly, uninterested, arrogant, rude and uninterested person in the world. The kind of person that intends to make you feel sorry for any inquiry you might have dared to ask.

Anything positive about this hotel? Well, the wellness center is ok, and they did make an effort to be trendy (endresult however, they failed somewhat). Well that, oh yeah, and they are right on the banks off the Spree, however if you are not a river fetishist, this will not make up for all the things it lacks. Stay away from this place!