It is our experience that cages with metal floors rust very quickly when exposed to urine or feces. The rusted spots are rough and dangerous to your hedgehog’s feet. Metal also holds in heat and cold, which can be very bad for your hedgehog, since they are a temperature sensitive animal.
If you must have a 2nd level, please be sure the ramp is solid and has a gentile slope. Your hedgehog could get his or her foot stuck in a grid ramp and it could end up costing both you and your hedgehog dearly. So you don’t have to worry about Hedgie falling and getting hurt, we recommend single level cages.
If you are looking for an appropriate cage, please consider either a Marchioro rabbit/guinea pig cage which has a plastic floor and metal bars, or a clear 90+ qt Sterlite storage container with lid.