A push toy would fulfil most of your criteria 
Seriously now, you don't say what you want the dog for and what you are prepared to do for the dog in return - in terms of exercise (all dogs should have walks no matter how small),mental stimulation - in terms of play, training, how long the dog is likely to be left alone - if long, what can you arrange in terms of dog sitter, doggy day care or similar.
Health issues - I'm sure we all hope none of our dogs ever develop them, but life isn't always that kind. Can you afford pet insurance, vet fees if your dog does develop health issues? Training? Can you spare the time and money to find a good training class? Can you put up with a new puppy's soiling/crying/sleepless nights/neighbours complaints/nipping/destroying of things whilst he settling in, learning what is acceptable and what is not?
So, in reality, without more information, it's impossible to guide you to your 'ideal' pal.
Seriously now, you don't say what you want the dog for and what you are prepared to do for the dog in return - in terms of exercise (all dogs should have walks no matter how small),mental stimulation - in terms of play, training, how long the dog is likely to be left alone - if long, what can you arrange in terms of dog sitter, doggy day care or similar.
Health issues - I'm sure we all hope none of our dogs ever develop them, but life isn't always that kind. Can you afford pet insurance, vet fees if your dog does develop health issues? Training? Can you spare the time and money to find a good training class? Can you put up with a new puppy's soiling/crying/sleepless nights/neighbours complaints/nipping/destroying of things whilst he settling in, learning what is acceptable and what is not?
So, in reality, without more information, it's impossible to guide you to your 'ideal' pal.