I had to rehome my 7 guineas a little over a week ago. I've heard that guineas generally get along well with chickens if they're raised together from the start, or maybe if the guineas are introduced after the chickens. From what I read on the guinea sites before and while I had my guineas, male guineas and roosters don't get along well at all and shouldn't be together especially if they're going to be closed up together.
We got our guineas first, our chickens came when the guineas were about 1 1/2-2 months old. The guineas were EVIL and mean to the chickens. The guineas wouldn't allow the chickens into the house, they would beat them up on a regular basis. Eventually the guineas were put out to roost outside of the house at night, they didn't seem to mind. Once our first chicken started laying, the guineas would attack her all the time. When they would find her nest, they would break and eat the eggs and force her to move/hide her nest. I was sad to see the guineas go, they're really funny birds, but I like my chickens more. I don't think it helped matters much that our neighbor didn't like the guineas. For the first few days that the guineas were gone I thought I might want to get another keet in the Spring and let the chickens raise it, now I've gotten used to how quiet it is without them.