When I painted my bunny room in our other house, I kept the windows open in that room for 1-2 days (can't remember) after painting and that took the smell out. I'd wait to move them back in until you can't smell the paint because if you can smell it, chances are it smells pretty strong to them.
As for making the bunny room look better, I think decorating it like any other room will help making it more "cozy". I am still in the process of decorating mine (I'm a procrastinator, LOL), but I added some colorful area rugs & a small couch in my bun room. I thought by putting a couch in there, I'd hang out in there more...but thats not the case - I think I may have to move my desk in there!
Anyway....I still need to add some pictures to the walls and put my bunny figurines & stuff in there (uhm..its been 5 months since we moved in LOL), but this is what my bun room currently looks like....
Oh...minus the rat cage (the SP Giant), they are now in the living room in a Critter Nation cage.
I guess my room still looks "cagey", but I don't see a way around that unless you make cages that look like furniature (there is a thread in this section on it...maybe page 2 or so?). The trick is to VACUUM, VACUUM, VACUUM....no hay mess or random poops on the floor - keep the room tidy and it will look less like a farm. I should post pictures of my room when it's "messy" so you can see what a difference having it "spotless" is :shock:, LOL!!