Our hamster moved house immediately!
The night after we placed this unit inside our hamster's cage, he woke us up with his rather noisy relocation efforts. He had his choice of three houses, including the one that came with his original cage that he appeared to love, but he never bothered with the other two after we bought this Playhouse.
He went straight into this roomy wooden box and made it his home. The next day, we lifted the lid to see what he had been up to and found one of the "rooms" packed floor-to-ceiling in cotton wool, and food stashed in various corners of the other rooms. He absolutely loves this house and the others have been completely abandoned.
In hind sight, we should have bought a smaller cage because it's this affordable little house that he likes, not the 3-level townhouse cage we spent a fortune on!