My guineas loved to just charge into my small flock of chickens while I was feeding them. Really scared the chickens. My small crossbred bantam hen got fed up and she confronted the male Guinea with obvious intent to have a go at him (she had chicks). Male Guinea grabbed her neck and then twisted. A few feathers flew, but I was relieved that there was no bad damage done. Guineas went into their own pen. NO more with the chickens.
When I first got them I put them in with the chickens. When they went to roost there was great disturbance. Some chickens moved to another roost.
Just not worth it.
The female would not want to nest in a community coop. She would need privacy.
I had some Lavender Guineas some years ago. They were very calm. She layed in the hens' nest baskets and never went broody. I hatched them in an incubator and sold many young guineas.
THis pair are the original color and not too domesticated. Male could jump a 5 foot fence even with both wings (primaries) clipped.
In future no guineas at my place and no geese either. The gander hated hens with small chicks and would attack them with murder in mind. I had to confine him whenever I left home for an hour or so. Male and female geese, 6 large goslings and 11 eggs all left here on Monday. A bit sad, but a relief.