We stayed one night at Hotel Marie and it was what we needed during our transfer to another island.
We have noted the hospitality and kindness of the staff: although we arrived a few hours earlier, they accepted us with an early check in at no extra-charge. The room was clean, bright and comfortable. The hotel is 10 minutes walking from the Marina, the main spot in Kos. There are numerous restaurants and small shops nearby. A beach is a 5-minute walk away.