This is the cheapest hotel I could find on HRS (Hotel Reservation Service) in the center of Kaiserslautern for a Wednesday night.
It's a pleasant enough place, but at nearly 70 Euros per night I found it a bit pricy.
The location is good, though, right next to the Garden Show and not far from the theater and the city center.
Second photo: Admittedly it looks pretty drab from the outside.
Muhlstrasse 6, Kaiserslautern
BuchenlochstraÃ?Å¸e 1, Kaiserslautern
Kaiserstrasse 143, Landstuhl, Kaiserslautern
Muehlstrasse 31, KAISERSLAUTERN, Germany, 67657, D