I know your pain paying $1k a month for a room for my little one college off campus. But I must say it's a really nice house, great landlord not your typical college place. My other daughters off campus housing was cheaper for me but real slum lord's.I am renting an apartment for my daughter who is going to grad school. Is not near the school, simply on a bus line that gets her there, in a nothing special part of town. Apartments are starting at $1700 a month for under 500 square feet. Realize this is South Carolina not SIlicon Valley.
Using the 30% math you would need to make about $70K a year to rent said apartment.