Some helpful, actionable pointers from the creator

The first thing that the man recommended, after having to deal with the issue himself, is to add some handrails going down the stairs into the subterranean structure.  Where he lives it gets rather cold and he was having issues with slipping when descending into his masterpiece.

 In addition to the handrails he later added an overhang to the entrance so that the stairs cannot get filled up with debris, dirt and other elements. It may also be useful for keeping animals out of the walkway preventing them from thinking they can make a home out of it.