The bedsheets/quilts/blankets were too small to cover my whole body: when covering my toes it only reached up to about my breasts. In combination with a cold room, this was a bit of a problem. Luckily I was staying by myself in a two-person room, so by also using the quilts of the other bed, I managed to create a manageable situation.
The hotel is however nicely situated right next to the RWTH Aachen campus, which is it's main selling point. The rooms were also clean, and the hotel is reasonably priced.