Wilderness cabins are bit low key compared to fully equipped holiday villas, but atleast they offer true adventures in Finnish nature. Just to make things simple, we can assume wilderness cabins don’t have electricity or running water. There are still some exceptions, so consider yourself lucky if you come across these luxuries.
You can find wilderness cabins for rent all over Finland, but there are also free to use cabins and other shelters in the National Parks. The rule of thumb is, if it’s not locked, you can use it! Hikers are allowed to spend a night or two in the cabins but you can’t reserve them to yourself. Be prepared to share the cabin and making some new friends!