I think this is way too high, especially if it is a free-market apartment. I paid a 12% commission on a big one-bedroom in Astoria in 2006, but that was a pretty good deal: $1700, about 1000 sf, utilities included (even air conditioning), pet friendly. I was also time poor at that stage.
Now, if I was in the rental market, I would only pay a double broker's fee for one of those mythical rent stabilized apartments, you know tony building, classic 6, doorman, parking, rent $1000 a month. Those mythical rent stabilized apartments might be standard on sitcoms, but they are not to be had in New York in 2013.