My boyfriend and I stayed one week in Martha's and Lefteris' apartment and spend a very relaxing and calm time at Kos.
Both took care of us from the beginning till the end. They picked us up on the way from the airport and gave helpful advices for our trip.
The apartment is very clean and well equipped. You can enjoy a beautiful view over Kos, the ocean and even Turkey.
If you're looking for a calm place in beautiful nature, just go to Martha and Lefteris :-)