I don't understand why this hotel is rated so lowly by previous reviewers but I'm guessing it's much improved since its recent refit. OK, you have to overlook the filthy windows in the stairs, the tiny lift, the sullen (unhelpful and underpaid, no doubt) staff, the lack of attention to detail of the housekeepers and maids, the rather unsafe handrail on the meagre balconies, the ill-fitted double glazing, and the worn carpets in the lobby.
Whoever manages this property and undertook the refurbishment should have addressed these flaws but actually, the rooms are great. Wonderful bed (terrible pillows), comfortable appointments (including a couch, fridge and decent desk), snazzy electric gizmos (curtains, bathroom blinds, shaving mirror), tasteful dark wood decoration, huge mirror, ample storage and a spectacular, walk-in waterfall shower.
I've stayed here for the past 3 weeks and despite the shortcomings, I'd come again and again. It's around the corner from Adenauerplatz and the end of the upmarket Ku'damm shopping area, the U7 and several major bus routes (M19, M29, 109, 110). There are a dozen decent eateries within a couple of hundred metres.
For the price, this is a steal.