I have mine in a hutch which is attached to a large aivary style run. The hutch gets the afternoon sun so my lot often up-camp and sleep in the run where its cooler. Also in really hot weather I put out a shallow container of water which they climb into and stick there heads under the water to cool off.
Smell wise, as long as you clean the droppings every other day (as Micheala suggests) and deep clean once per week you wont have any noticeable smell IMO.