First, you will be the one cleaning the cage, trust me.
Second, let me suggest getting mice instead of hamsters. We have 2 fancy mice, and they are just as cute (cuter IMO
) than hamsters, but the most important thing is that hamsters tend to bite, whereas the mice usually don't. Mine have never ever bitten. Also, when you can't catch them, you can usually get a hold of the tail.
As for the smell, I have had lots of experience with that LOL. First off, know that the males smell worse than the females. Also, it is good to get them in pairs, since they are social creatures. Two females get along well, but two males will usually fight--even if not at first, they will eventually.
I have found the one thing to keep the odor down. It is called Aspen supreme (they have it at petsmart). It looks like rabbit pellets. Put this in the bottom of the cage (enough to cover) and then top that with the white (not the natural color) carefresh bedding material. You can change out the carefresh and leave the bottom material, and you can get two weeks out of each cleaning this way. After two weeks, you have to dump all bedding material and clean everything.
If you have any other questions, just ask. I'll help with what I know.
PS, look at my youtube videos (link below) and you'll see my mice and their set up for ideas.
there are two mouse videos there.