Is the question "What Italian city of 155 were Leonardo da Vinci , Michaelangelo , and Machiavelli all working in ?" asking about an entity, an abbreviation, a description, a human, a location, or a numeric entity?

OPT:
 (1). description.
 (2). entity.
 (3). abbreviation.
 (4). human.
 (5). numeric.
 (6). location.
(6).