I had to overnight in Letzlingen while visiting the nearby German Army combat training centre and chose the Schlosshotel on the recommendation of colleagues.
The hotel is situated away from the town center and is an interesting building in itself. The rooms are small, but clean and the beds comfortable. My only real gripe is you know you're in the old East Germany with the amount of smoking in the common rooms that act as a relief from the small bedrooms.
Other than visitors to the CTC, I don't know why people would stop in Letzlingen, but there were a number of people staying the night I was there, so something nearby must be interesting. More