Map Making/Creation for existing city

Hey guys, I’m leading a Berlin Chronicle right now, for three sessions already.

I need help with creating a map, I know there are plenty of maps of Berlin out there from all centuries..Maybe someone still knows a page or source with a great collection of different maps, especially of Berlin?-the more the better.

Is there any program that helps with the segmentation of the city in districts/territories(of the sects, the clans and other splats..)?

Maybe someone has some tips/ideas how to make the city really alive and „vampirey/kindredy“? With cool locations, must have locations/events (like a Succubus Club, a Tsimicze BDSM dungeon in Friedrichshain, some ideas..) and also cool NPC‘s?

Where/how do you get your ideas?

It would be great if the program would be free or very cheap, as I’m a student.