I reserved superior room, but I was disappointed at the narrowness of the room.
According to the explanations of hotel persons, the difference between superior room and standard room is only minibar free service, and the rooms itself are completely same. The price of superior is relatively more expensive than standard, and I never pay surcharge for "superior = minibar service", if I use this hotel again.
The location is really wonderful to access the main sight-seeing spots in Erfurt, and the service level of hotel staffs are acceptable (The waiters and waitresses at breakfast room was very freindlly) . The miss of my reservation was to pay extra fee for worthless superior room.