Our space-saving washbasin installed above a washing machine. A piece of warning here, this customer's installation breaks electrical safety regulations (washing machine should not be installed so close to the bathtub), so the user will have to verify that the washer is fully disconnected beforeusing the bathtub. There was not much choice in this case: it was either this, or hand-washing the baby's clothes !
Leaky faucets can be fixed with a little elbow grease and know-how. First, turn off the water to the sink and stop the drain with a rag so you don't lose any small parts while you're dismantling the faucet. A compression faucet needs a new rubber washer to seal the valve, and a drippy washerless faucet can be stopped up with a new O-ring.