We don't have one, and I regret it.
When we bought this house we remodelled downstairs, and knocked through what had been a breakfast room, kitchen and scullery into one large room. The children were young, and I liked the idea of being able to do the washing and keep an eye on them at the same time, so had the kitchen plumbed for utilities instead of using the boot room at the back that could have been used as a utility. All the floors are concrete, so changing the layout or services would be an expense and a logistical nightmare, so we will have to live with it as it is, but I would much rather not have the washing in the kitchen if I had a choice.