My family and I stayed at 57 Mud Bay for four nights over the 4th of July this summer and really enjoyed our experience! My extended family has been coming up to Lopez since the 70s and have a cabin on the peninsula, so we know the island quite well. I can say without reservation that 57 Mud Bay is an authentic Lopez experience, with the stunning view, surrounding flora and fauna, and general vibe you'd expect from the San Juan's crown jewel. The house itself is very comfortable, with ample space for a family of four, a spacious deck, and an absolute plethora of reading material. I was even able to scrounge up some children's books for my 4yo to read before bedtime after we forgot hers at home.
Overall we loved it and would definitely stay again!