Couple of things I'd advice to start-
I wouldn't put them in your DD room . The piggies are messy little tykes (my 2 sow/ 1 boar groups are in our little bedroom and their hay travels like it has legs [sigh] ). There's no door on the bedroom which means more interaction but doesn't curb their mess.
And they are noisy. I thought hamsters were the nocturnal furries but guineas are crepuscular (active at dawn and dusk) so anytime for them is make a din, chew cardboard and rumble about time. 3am works for mine 
My boar is in a 4x2 plastic based cage , my sows have a C&C set up ( 56" x 28" ) which has the advantage that I can change the shape.
They are in for winter but have a Pighouse (old wooden playhouse) . I usually put them out in the day with heat but its been colder this year. my piggies are a 3.5yo and last year I had 5. The two older girls died earlier this year.
I love the pigs , they belong to DD and I, we share the feeding and cleaning and all the gubbins that goes with. (Though only one is mine )
They don't like direct sun, extremes of heat or cold, changes to temperature (so when ours do go out I need to make sure their Pighouse is a good temperature for them).
Are you set on sows? There's more boars in Rescue , lots of Rescues neuter the boars now to make sow/boar pairing easier.
It doesn't change them temper wise but you don't get the risk of impaction.
Boars are lovely snuggly pigs, really don't smell (its the hay that smells) but need loads of room.
My sows pee loads and are messy. I cage clean every day (fresh lining and hay in the sleeping areas at least)
Good Luck, we loves our guineas 