For tourists, this might be the best starting spot in Guanajuato. Most of the important attractions are just around the corner.
Info http://guanajuatomexicocity.com/Guanajuato-guide/Plaza-Paz-Guanajuato-mexico-guide.php
Address Plaza de la Paz, 36000 Guanajuato, Mexico
Coordinates 21°1'0.192" N -101°15'14.219" E