I have to say I agree with Kryll. While bigger is generally better it doesn't always apply. My robo Hector is in a mini duna which I know that you consider to be a terrible cage Kittokitty
I did my homework before I got him as my hamster knowledge had become rusty & outdated & the best thing seemed to be to get him a smaller cage to start with to make taming easier. The plan was to then upgrade him to something bigger & keep the mini duna as his holiday cage. Sadly Hector disagreed with this plan
He was a p@h rescue who had been beaten up by his cage mates. I don't know how long he'd been separated & recuperating from his injuries & I don't know how long he was waiting to be chosen after that but all that time in small enclosures seem to have made him slightly agoraphobic, for want of a better word. He didn't settle when he got upgraded & all his bolshiness got replaced with extra skittishness. When he got downgraded he went right back to friendly Hector (when I say friendly, I mean gung-ho in his efforts to get sunflower seeds from my fingers but y'know I'll take what I can get
)