

I've been using straw - my coop is an old horse stall that i enclosed with chicken wire. I put perches at the top & a shelf going around half of it with nests. My girls seem to like it. the stall is about 10x10 or 12x12, i'm not sure of the exact dimensions. I have a run attached that is about 30' long & 12' wide & 6' tall. I haven't had any problems with the smell - i clean out the coop once a week. I have a method of breaking down my straw.
Fresh straw for the nests & directly under the perches, the 'poo zone' after a week all the straw in the coop gets drug outside & piled into a mound. fresh straw goes back into the poo zone. the pile of poo straw gets 'broke' down by my chickens, or 'composted' after a week of getting battered by the girls i haul the now teeny tiny straw pieces to the compost pile out of the pen.
They're pretty efficient at breaking the straw up! This is working well for me. So far.