Thanks for the feedback!!!
So, after talking to him yesterday, I got this email last night.
"Sorry you couldn't approve the rental immediately. I just wanted to touch base with you to talk about any concerns you might have. Yes, I have about 10k in savings right now, though this isn't going to be depleted in 6 months as I am still working. My income is as following:
-$1600/month for 9 months of the year = $14,400
-$6000 for the entire 3 month summer term = $6k
-Approximately $10k for my work with PokerSite123.com = $10k
-An additional $10k in fellowships/grants through school = $10k
My tuition and health insurance are fully covered and I have no costs there (so if you want to add in 8k for this, feel free, but I am not counting it), nor do I have any car payment to make. I should also note that I'm expecting additional fellowships and grants starting in the Summer/Fall of next year, but nothing is formal yet.
If you were wondering why my fiancé did not want to be on the application, it's a thing with her parents. Additionally, although she is also a Ph.D. student like me, she is unemployed right now, so it doesn't seem as if it would help the application.
I'm still really interested in renting the house and hopefully the fact that I've never missed a payment (car, apartment, credit card, student loan) means something. If you need a double security deposit then I can do that, or if you want a few months of rent up front, I can do that as well. The house location is perfect, the price is right, and we both loved it when we checked it out."