Rabbits are one of the easiest and most useful animals to keep, even in an urban location. They are quiet, non-aggressive and do not require much in terms of food or space. They are easy to breed, and they make excellent manure, meat, and fur.
The idea of an animal tractor, in this case for a rabbit, is becoming increasingly popular, in both rural and urban settings. The premise is simple. Make a pen that can be moved around a patch of ground that you need worked. In the pen, you put an animal whose natural tendencies match the job you need done.
Rabbit is an excellent meat. It is very similar to chicken in a lot of ways, but is easier to process and has more meat on the carcass. Plus rabbits are far easier and quicker to breed than chickens. Rabbit meat is an easy addition to a sustainable food production system.