Pullout veggie spray tap over kitchen sink...bucket filling solved!! Seriously save yourself the agony of what the next resident may want, all you need to empty the washing machine is a pipe. Laundry can go anywhere but it makes sense to me to put it in the ensuite for a 2 person house as that is where the majority of the washing comes from.

Hi Bianca, I have just seen your post. I personally think the best answer to your question will depend on a few other considerations because it really depends on the kitchen layout as a whole. Considerations may include; how will this affect the work flow in your Kitchen and what are the alternative positions available to you? Importantly; how big is your island going to be; an Island can be a great space for food preparation, meal plating, as well as the island being a social space for family as well as when entertaining. When placing the Sink in an island you may consider a sink also needs adequate additional space each side of it for the various functions it is used for; whereby placing a sink in a small Island can sometimes take away from the other benefits it provides. There is actually no clear yes or no answer, but to consider your Kitchen layout, appliance placements and its work flow as a whole. With the other things you have already mentioned here, I hope this extra helps in your decision process.

I would attach it to the vanity, it is awkward to try and reach behind you if you attach it to the wall or you could try a freestanding one that you could put anywhere though they might take up a bit of room when space is a bit tight

Note - This is what I think of the concept in general. It's not a criticism again the OP - I think Butler's pantries are better idea's in concept than practice. I've not understood the rationale for a kitchen thats separate to your kitchen, unless of course you are prepping all your meals in there in which case what is the kitchen for? I think it's a sign of the times that we have more space and more money than we know what to do with when we start installing two kitchens in the same space. Of course I understand the rationale for a pantry. A place to store food items that may not be used frequently and the same for appliances. In the days when food was only available in season and the only way to preserve certain foods was to pickle and bottle it then a large space to store those supplies was necessary. We live in the modern age now where any food can be gotten easily and cheaply all year round. So these spaces are housing mostly appliances that we rarely use. And if we rarely use them you have to ask yourself why you are holding onto them?