Not so sure about having high current appliances in a bathroom. Even in a big cupboard at the end.
We’ve had our washing machine and dryer in an upstairs room for about 12 years.
The alternative was putting it in the cellar but that would have made for more of a chore and would bring problems of damp and so forth too.
Upstairs, The washer sits on top of a paving slab for more stability/less movement.
An upstairs laundry room makes the logistics so much easier.
Getting machines up there is not so easy, but John Lewis delivery folks have been very obliging.
Leaks? The washing machine sits in a tray and has its own anti-leak set up. When our old machine spewed its watery load due to some aged seal or pipe or something we had a few drips make it into the downstairs bathroom but the rest was easy to deal with.
I still don’t really understand why machines are typically in the kitchen: that’s for cooking in right?