We (myself and two small children) have rented a handful of cabins and this is the first one that didn't give one kid or the other a scary vibe. Everything was great and we hope to come back during warmer, calmer weather so we can visit Pictured Rocks. The check-out rules are also incredibly simple: basically, just tidy up and take the garbage to the dumpster.
If you're coming from the lower peninsula, I highly recommend taking the rt 123 route and stopping at Tahquamenon Falls, which only adds an hour to your driving time.
If you're going rock hunting around Two Hearted River/Crisp Point, learn about two-track roads and ***avoid them like the plague*** unless you're entirely confident in your 4x4 vehicle. We got stuck on one next to the "airport" at Mouth of Two Hearted River and we're lucky to have had cell service to connect to 911 and the tow company. (Even the locals were surprised.) If we hadn't, we'd probably still be stuck there. You can get direct, easy access to rocks at Grand Marais, which is only an hour away from the cabin. Just take 28-> the literal end of 77 to avoid dirt roads.
Falling Rock cafe & bookstore in Munising has great food an a little indoor play area for kids, as well as books and games.