Guinea pigs ARE very talkative. I don't think you can stop them. The hiding place is a good idea. I made for my guinea pig a "bedroom" with a small polystyrene box that I cut to make a door. He was very comfy sleeping on it

And sure, if they are lacking attention and they want more cuddling from you, they will also tell you loudly! Don't leave them alone, it will probably be worse

I don't know if it helps you...