I bought that exact same cage for my rat. Do NOT buy it. It's VERY cheap. The wheels pop off, the little "floors" were bent and did not stay attached to the cage. all the layers would fall down. Not to mention all the bars on the cage were bent.
I would not purchase it. It was in extremely poor condition when I bought it.
I'd suggest one like this : Super Pet CritterTrail Two - Cages Re-Direct - Directed Searches - PetSmart
Thats what I keep 2 mice in. They love crawling everywhere in it.
But I think the best way to go is in a regular 20 or so glass tank. Throw some things in there they can crawl all over. You can redecorate it as much as you want and they're much easier to clean than any other cage.