If you have nothing else in that area you shouldn't have any issues. One of my brothers has an 1100 watt kicker amp in that compartment in his tahoe which is even smaller and he has not had any overheating issues. The nice thing about it is like I said there is a channel on each side and in between the seat backs and itself for running wires over to the factory amp for signal on the left side behind that vented panel you see in the picture. If you were really wanting to go hardcore you could probably take a router and route in some small venting for air release but it is not air tight so air is moving in and out of it already.
What is the setup you are doing?
Amp brand and size?
Sub brand and size?
Box set-up?