I stayed one night at Motel One Hamburg while passing through Germany. Arrived late (after midnight) but check in was not a problem. The hotel crew spoke good english. Parking overnight in the garage under the hotel was cheap, just a few euros.
The room was small but very clean and nice, with up-to-date interior, flat screen TV. Small but functional with a small desk, bathroom with shower, and a bit odd - the sink not in the bathroom but just outside.
Overall the room quality was much higher than you would expect for the price, but as mentioned a bit on the small side.
I would not recommend the hotel to anyone looking for a five-star experience with room service etc, and the location is maybe not the best if you want to experience Hamburg, but for a cheap overnight stay with a nice room I don't think there are any better options.