"ROOMIES!" - First, I want to say Leah is the BEST. I was a little freaked out at first, because I didn't realize I would be sharing her home (as opposed to mostly having my own space), but once I met Leah and talked with her, I was completely at ease. I will say, if you aren't comfortable with a roommate kind of situation, you might want to choose a different rental, but if anyone can make the roomie thing work, it's Leah. She can make herself scarce, or she can be there to connect with, totally up to you.
One thing I will mention: my bedroom wasn't completely closed off - there is an opening in the wall by the staircase, which still allows visual privacy, but not audio privacy.
Also, there is a train that passes by one block away at 3:30 each morning, and the train horn is super loud. After a few days, I got used to it and was able to get right back to sleep, but it really blew my mind the first night.