just to add... "toys for entertainment won't work with a puppy or likely adult dog, usually the dog needs someone to stimulate him to play with the toys, intelligent breeds, working breeds, herding breeds etc tend to get bored when home alone, when they get bored they do things to alleviate the boredom, those things include: excessive barking, destructive chewing (never the things you WANT them to chew,but things like shoes, furniture, rugs, walls, jewelry, electric cords), also scratching doors and floors, developing self soothing behaviors such as scratching bloody holes in themselves, excessive licking, excessive peeing or pooping, attempting to escape the apt...
Remember that in order to leave a dog home alone that dog needs to be trained to be home alone, and that can take months... I don't advocate leaving a dog in a crate, all my dogs have always had free roam of my house but they've been trained for it.
As far as getting a rescue dog, thats wonderful but don't have the assumption that you can get one one and just leave it home, alot of rescue dogs have separation anxiety and other behaviors that need work, its very similar to getting a puppy in that you need to figure out what they can tolerate and what they can't.
Thats just mho from the top of my head, I also worked in humane LE for a long time and this is coming from my experience.
I hope your able to get your dog, but just remember there is a HUGE amount of work that goes into it, and some of the destructive behaviors I mentioned above if they happen can result in massive vet bills and/or very problematic relations with your neighbors and landlord.