San Lorenzo Cemetery's first burial of record was in 1853. The cemetery is on property that was originally owned by two John Lewelling and William Meek. Lewelling Blvd. located down the street was named for John Lewelling, and William Meek was the areas largest landowner at the time.
More information on the cemetery can be found here . This is where I gleaned the information provided.
The rating should be accurate. Some will find it easier and others may find it harder. The cache is visible from the correct angle and no mirrors are needed to reach that angle. The cemetery is closed to public; there is no reason to trespass