At any rate, if I'm right, you are currently listed at $1500...but the last time you leased this unit, you leased it for $1300. As well, most of the units in that complex rented for $1300, while a couple rented for more, but only once did anyone get $1500. Off the cuff, if I've got this right, I'd say you are listed too high. Of course, I haven't seen your unit...things change...etc. But that's what feels wrong. At $1500, the listing has been active way too long, so price must be a factor.
Also, it seems you switched brokerages this go-around, even though the last brokerage rented the unit in about a week. To be honest, I know and respect the first brokerage, while I don't know anything about the current one.
Of course, I could have the wrong unit totally, and you aren't in MLS. If that's the case, I highly suggest working with a brokerage that offers more comprehensive marketing.
Best of luck.