I picked this city because one part of it in particular is this small village by a mountain. This mountain could act as a border, meaning it’s a well-isolated area.
However, there is a downtown area nearby, so that would be useful in case I needed supplies or communication. Also, the downtown area has a hospital, so that would also be very useful. And it’s still a small city, so there could be less of a chance of infection spreading.
Also, it helps that there is a river nearby. This would be a good source for water and food.