If you are wondering why you should be discreet, most apartment break-ins are done by neighbors! Some less than honorable characters see that you live alone, see when you come and go, see what car you drive.
Then one day they find out you have something that is easy to dump for cash, they break in.
I cannot emphasize this enough, if you own firearms and live in apartment, be very very discreet when moving them to/from your car. Cover them up, and when possible, move them when it is dark. I always made it a habit to first walk out to my car to see if anyone is just hanging out in the parking lot. If anyone was around, I would wait to move my guns.
A golf bag is not a bad idea. Square gun cases are always better than gun shaped ones. Duffel bags or a rug also work.