The word I will start this mini-blog series off with is disorder. Disorder in this context means a place with a lack of (or lessened) security presence from the government and/or police. I bet you can imagine such cities in the world right now.
As I have mentioned before in one of my stories, a world without security is a werewolf paradise. The streets are unofficially administered by gangs or local toughs. People tend to mind their damn business. Nonetheless these are the kind of places where people disappear all the time; many a murder go unsolved; and people generally live in fear.
A veteran lycanthrope can blend in, not be noticed, and study and learn how the place really works. It is far easier to hunt, kill, and eat human prey in these kind of places and never get caught - or if the lycanthrope is discovered people will run the other way and not involve the police. In a pinch the lycanthrope can even pay to have victims brought to him/her with lifting much of an eyebrow. This type of environment is frequently found in war-torn countries or ones where most people are desperately poor.
The next level of city is maybe more common. Maybe it is in your city, in a slum, in a place where many people who do not belong do not tread. Much of the same dynamics described above apply to these neighborhoods. Frequently there is a transient and peripatetic under belly to these places - lots of cheap motels, etc. Again, this is good for a werewolf. You've heard it before and will hear it again: people disappear all the time.
The next type of area is not necessarily a city or neighborhood, but part of a region instead. Let's take for example the world's busiest border crossing area between San Diego, California and Tijuana, Baja California. There is a crush of thousands upon thousands of people moving everyday through this corridor, through official and unofficial points of entry. The latter take their chances through the nearby ubiquitous canyon systems and craggy mountain ranges. I imagine you can think of other areas with similar peculiarities.
Okay the next thing the lycanthrope must have is territory. Maybe a lycanthrope already has claimed the neighborhood. There could be problems.
To be continued...