What a unique place to stay! Exactly the kind of stay my family and I were looking for- quiet, private, directly on the water, and completely away from anyone else! I can't imagine there are many places on Milos that can replicate this Boathouse. If you are active and like snorkeling, kayaking, hiking, and being "off the grid" this is a phenomenal place to stay! We had phenomenal weather with almost no Northern wind so we were snorkeling and kayaking every day.
The only possible downside I saw is that being in a remote part of the Northern coast of Milos means that a decent amount of ocean debris accumulates on the beaches near the boathouse. It would be great if that could get cleaned up. I realize this technically isn't the owners responsibility, but the beach is effectively private so a little more attention to the areas adjacent to the boathouse would be nice.