"When I bought my first two rats (females) I also bought this cage, thinking it would be ample size for them. From the get-go this cage was far too small, even for girls. The platform is only big enough for the food dish and water bottle and with the ramp, a house, a litter box and (if you creatively arrange it) a wheel, there is no room to run around as rats need to do. I immediately purchased a bigger cage (the My First Home for Exotics -- PERFECT) and now only use the cage for quarantine purposes and, should there be an accident, as a maternity cage.
My advice: bypass this cage. It would be fine if it was more spacious and had a few more ramps. Also, the quality is shoddy and the ramp clips snapped the first day. :("