First of all - I can highly recommend Maria's House! We stayed there as family from Germany with 3 persons during May/ June. We stayed 2,5 weeks. Having travelled to all across Greece for many years, we have experienced many different places and Maria's house is definitely a little paradise.
It is located in close distance to Kos town but still a quiet, relaxed place surrounded by olive trees and a beautiful garden. The beach is in walking distance and the bus station for the bus going to Kos town is also just around the corner. For your daily supply, there are very small supermarkets on the way to the beach and a bigger, well-sorted one where you can walk or drive. The apartment is very clean and fully equipped with all you need. Also, because of the garden, you have a good chilled climate even when the weather is getting hot.
Most of all, I have to highlight that Maria and her family are amazing hosts! We felt very welcomed, comfortable and safe. It was like visiting friends and being part of the family but still having private space. Maria and Nikos are really very helpful and caring - whenever we needed some information or help, they were there for us in a very friendly, caring way. You do not find that kind of familiar hospitality combined with professional hotel business that often. Five-star recommendation without any hesitation!