I have this hamster house that I found on eBay, the 15x15 one. My little fluff ball seems to like it. It’s nice and dark inside and plenty big enough for him and his food stash! I’m keeping my eye out for signs of chewing as I’m not sure what kind of wood it’s made from but he doesn’t show signs of chewing anything, much less his house.
https://m.ebay.co.uk/itm/Rodent-Hous...=1866657053007