Sagi (aka my home) is definitely my favorite cottage

Out of the ones available that you have mentioned my two choices would either be Venus or Moon

Pisces is a cute place but quite small and close to the road, so there will be noise of the comings and goings on the property as well as the street, but it is quite a nice little cottage for the price and does have a nice deck and hammock, etc.

Gemini II is the better of the Geminis, bigger rooms than Pisces but does share a wall.

Sun and Venus are in the newer building. They are suites and they are extremely nice, I don't think anyone could ever find a negative thing to say about any of those rooms, and the views are spectacular.....you just can't go wrong.

Moon cottage is an incredible room. I prefer the Star only because it is a bit closer to the water and has that unbelievable outdoor bathroom area, but Moon is also really cool. This is however the only room out of those that you mentioned that does not have a/c so it might depend on what time of year you are going as to whether or not having a/c will be a big deal or not.
Moon is a really great cottage, with an awesome wrap around porch with a great big daybed.

But like it has been said many times before.....once you get there you will see.....you can't really go wrong anywhere you stay on that property! You will love it!