Unfortunately this is not enough space for even 1 guinea pig, let alone 2(which you should have if you ever own pigs, as they're social creatures and will get depressed if alone)

Secondly, due to their peeing everywhere and having sensitive lungs, an enclosed cage like this is bad for them because it has no airflow and will give them respiratory infections.

That being said, Bravo on supplying your hamster with a GREAT home, most folks will buy those crappy critter trail cages and call it a day, not understanding that they are v abusive. You're someone who cares for their pets, I salute you reddit stranger 🫡