A clothes washer for a small place
I looked at the a couple machines, but they were expensive and I couldn't get past the sticker shock.
This one, the Eco-Egg, looks interesting. It connects to the faucet, which is easily accomplished with a gizmo you attach to the end of the faucet. Since it's so inexpensive it can't have its own heater, so must be relying on the quality of your hot water as it comes out of the faucet. It also cannot have any drying function, so you will have to come up with a way to drip-dry your clothes.