All toilets should be clean and work properly. Take the seat/lid portion apart every few cleanings to make sure the area gets a deep clean; this will help prevent any “bathroom odors” linger in the room.
Carefully inspect the toilet bowl, checking for any cracks which may require replacement of the entire unit. Flush the toilet several times and make sure the handle does not get stuck and that the water stops running in a timely manner. Sit on the toilet seat. This may seem silly, but remember you will be accommodating people of all shapes and sizes. You will want to make sure the seat is secure and doesn’t rock back and forth.
Here is a good guide if you are looking to replace the toilet. If space permits consider getting an elongated toilet since the standard round toilets are smaller and not as comfortable.