Renter offering 12 months up front

[Jacob Stark]

We just started marketing a rental in the Dallas area and one potential renter has offered us 12 months rent up front.  We're thinking this is a no-brainer to take (assuming renter passes credit/background checks) but just curious if anyone has any experience with this or gotchas that I can't think of.  If you've done this before, did you offer a discount based on up front cash and if so, how much of a discount?  Our margins are slim on this one, but would be great to get 12 months all up front.  Thanks all.