Ok there is no hiding spot in there because when we have mice in there and a hiding spot he just hides and doesn't eat the mice. Our cat isn't allowed on top of the cage except for when we are around and he knows it lol. And besides, that wire is very strong. xP I could sit on it and it would barely bend. And about the size of the cage, we had a bigger cage but the glass got broken so we can't use that one anymore. =/ And we do have a thermomiter. Its in the corner hidden by the wood top. Its fairly little.