Set clear agreements
The most common reason for fights are not having clear agreements. It will important to create a cleaning schedule, so everyone knows when they are expected to clean the bathroom and kitchen. Make sure to put in the schedule which tasks are part of it and which spaces you would like to keep clean. You could also divide the fridge and kitchen cabinets between all the roommates, so everyone uses their own space to store food and drinks. It is always a dissapointment when you come home and the pizza you were aiming for has dissapeared..
We also advice you to set agreements about who is paying what. There are many apps on your phone to split costs weekly or monthly. Money will always be a sensitive topic.