AUB are building their own accommodation block right on campus and my understanding is that this will be available from September 2020.
I have seen it going up and it looks great and so close to the AUB facilities.
If you were unable to get a room there, you might want to consider one fo the private halls.
Here at Home Park we accept students from both AUB and BU, from first years up to PHD, so there will be a good mixture and loads more opportunity to meet a variety of people.
You can find more information on the student roost website where there is a handy live-chat facility which is monitored 24/7 so there is always someone to answer any questions you might have.
Whatever accommodation you choose, i wish you the best of luck for your first year at AUB