To be fair to someone who is considering keeping ducks in a residential neighborhood, female ducks generally do quack and they can be quite loud. This is, of course, the opposite of most chickens, so it's worth pointing this out to someone who may be unfamiliar with keeping ducks. Are there...
Welcome to BYC! Lots of good advice above. A couple other things to consider:
Have you asked your landlord?
Are there any local ordinances against keeping backyard poultry?