Can a hamster live in a guinea pig cage?

[BrainGirl]

I just bought myself a second-hand Duna Multy-type cage but with the wider bar spacing suitable for guinea pigs. It looks absolutely fantastic, the pictures can't do it justice! It is mostly plastic but the wire lid is almost the full size of the top of the cage so I can't see ventilation being a problem. I will definitely post pictures when I'm finished setting it up