14%, not in city center but along a subway route, near its own hub. 2b2br for 2 people in "luxury" building - doorman, gym, train access, great soundproofing, community wine nights. Granted, my "half" is 28% of my pre-tax salary, SO makes more than double what I do. And when we had a roommate, it was 9% (or 18% of my salary).
I have to admit, I feel like we're paying a LOT for housing right now, and we have seriously looked into moving since the roommate left, but it turned out to be costly for our time window (moving cross country in less than a year). It's 38% of our actual expenses, and I think my comfort level is crossed at that good ol' rule of 1/3 of expenses.