My oven is a Westinghouse. The serial numbers are as follows:- POL660S*02 230-240 V a.c. SERIAL: 52610542 APP NO: S/91  The problem is that it cooks unevenly and burns the base of everything no matter what rack I use. The heating element is on the bottom and fully exposed (which I have never seen in previous ovens I have used.)  As I am in a rental I cannot replace the oven. Is there a solution to this problem?  TIA 
I have the same problem. It seems landlords prefer lowest cost appliances, but as you said you cannot choose. Having the heating element below the oven interior is preferable. In this situation I do two things differently:    1) Use an oven thermometer and check it both before and several times while cooking. In my case, the oven temperature is 50F above the dial, and temperature regulation (between when food is in or out) is poor.  2) Use heavy gauge pans or cooking sheets. Also Pyrex seems to work well. Thin metal baking pans or sheets tend to burn food easily.  Using a baking stone as mentioned by @Megha is also a good idea. 