As Alex mentions, everyone has different levels of sensitivity but I find that I am also rather sensitive to smells. So long as you spot clean there should not be an inherent lingering odor from the tortoise, but there may be from humidity, etc.
That said, and I know this isn't what you are...
No worries, i was in the same boat and mine was in a "double wide" (two 2 x 3 tortoise houses) for a few months. They can endure quite a lot, so long as you are going in the right direction.
Next you will want to focus in temperatures and diet. The links provided will give you good info, but...
can you also do photos of the tail and underside of backside? Will help people tell if you if a boy or girl.
For water you can just get a cheap terracotta saucer and sink it down into the substrate. She won't hurt herself with it.