My dwarf hamsters frequently go inside the hut to hide or sleep, and they also use it to climb around and go up to the cage's next level. Impossibly sweet, but also very practical!
My gerbils loved it ! They chewed the windows so they had another way in and out :)
The gerbils have loved having this as a little home and as something to gnaw. They have however gnawed through it very quickly and after just 3 weeks there is less than half of it left!