Do you have space for a garden? Could you somehow spread the manure into a large garden? I like the aromatic flowers idea.
What way does the wind blow most often on your farm? If it usually blows north than place it down wind of the house.
For what its worth, the smell of manure piles at where I work are not an issue. There are only around 10 horses. The smell is not a problem, the issue is the flies. If you are having a B and B I would have a bigger plan in mind for the flies and keeping them out of the house and the kitchen in particular. Thats the issue at work, the flies sneak in. Thats not as big an issue in a vet clinic and a big issue where someone is eating.