This diploma project deals with the area Choneftiko, near Kymi in Evia, as its waters' very specific features have made this area a destination of water treatment. The often referral of patients, from doctors requires the creation of a hosting infrastructure, which although, won't affect the area and its relation with the inhabitants. The proposal is to create a guest house, accomodating 20 people, in order to comfortably stay there throughout the year. This intervention includes the building that already exists in the study area since the first years of 70s decade and was operating as an entertainment center. The part of the guest house is placed opposite the existing building, and the wall which follows the path,hides it, in order not to be seen and not imposed on visitors who are many because of the water. The formation of the route remains, and the area of the tap is redesigned. The materials used, as some of them are already in use, they are all in line ith the colors of the area, while the choice of the green roof and the composition of most materials, manages to respond to the difficulty because of the significant amount of moisture.