Measured in cubic feet of airspace, the room we had for one night here was spacious. A high-ceiling room, to be sure, but in terms of actual, usable space, we got a room that was comically, absurdly small. You might as well have put four walls up against a bed, with a door in one wall through which you could leap and land on said bed.
There was practically no walking space. With two people, you had to choreograph your moves so you didn't fall over each other.
That said, this was only one room we saw; I'm sure others must have more space.
The Graf Moltke is an acceptable choice for a budget-conscious traveler who wants to be near the Central Railway Station. The staff were helpful and courteous. One big minus during out stay was that the elevator was broken, so you had to haul your bags up the stairs, but they had folks ready to help.
The bathroom was tiny but adequate. The breakfast was quite good and varied, perhaps a standout feature of this hotel.
While centrally located, it is in a bit of dodgy area, with streetwalkers plying their trade nearby. A better alternative, perhaps, is their sister hotel, the Eleazar, located a block or two away. We stayed there, and all was comparable except we had a much larger room, meaning the usual small, European plan room.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC