Where do you write when you're in a tiny house with 4 other roomates and one of them is your girlfriend who you share a room with?
I would probably go to a library or find some place where I can get a coffee and write there.
I wouldnt be even able to function normally with 4 roommates. I always get depressed when there are people with me 24/7 and have no place to go to be alone.
But I dont write so what do I know.
Get some earplugs and find a comfy cranny where they'll leave you alone. If they won't, abuse them verbally and psychically until they do.
I suggest the bathtub, padded with towels if it's cold.