Like:
18" poop board covered with linoleum under the roost makes cleaning very easy.
can stand inside the coop
nest box has a door to collect eggs from outside the coop, this makes egg collecting very simple!
I made one extra large nest box since the girls all want to lay in the same nest anyway.
interior is painted with oil-based semi-gloss paint, it takes a long time to dry and it is more difficult to work with but it forms a hard sealed washable surface, I love it!
the doors all close at least 6" above the floor so the bedding doesn't fall out.
I have the coop raised up on concrete block to keep it dry during rain/flooding.
the human door gives access to the coop from outside of the chicken run. So, I can close the chicken door and clean the coop without having the girls under my feet.
dislike:
the door is only about 4'6" high and I frequently bang my head on the door jam. A full size door would have been smart.
As far as the 2 story coop goes, mine has an upstairs and a downstairs on the inside but I wouldn't keep my chickens inside all day, I want them to have access to the yard to scratch for bugs, eat the grass and anything else they find to their liking. You can't clean under the coop very easily so, I would only want a tractor as a 2 story coop so the poop wouldn't build up and concentrate the stench.
Hope this is helpful.