While in A school, you will live in a 4 person room. It will be on large room, 2 sets of beds, 4 desks and 4 closets. You will also have a vanity with 2 sinks, and a head to share with those 3 other people. Plus a kitchen table, mini fridge, microwave and a sink with a little counter space. They are pretty nice compared to some of the other barracks on base
Once you graduate, and move on to C school, it will vary based on what C school you choose.
Overall, it is not too bad, and you get used to it. If you have a problem with your roommate, (especially with cleaning) just talk to them. Don't let things fester, and be willing to communicate and compromise.
As a married person, I lived off base, but was still responsible for a rack and a room for my duty days. I ended up being responsible for cleaning a room I didn't live in. But it was a bit cleaner than others rooms, with one less person living there!