22. The CPT recalls that the aim in any psychiatric establishment should be to offer material conditions which are conducive to the treatment and welfare of patients; in psychiatric terms, a positive therapeutic environment. Creating a positive therapeutic environment involves, first of all, providing sufficient living space per patient as well as adequate lighting, heating and ventilation, maintaining the establishment in a satisfactory state of repair and meeting hospital hygiene requirements. The delegation noted that hospital management was attempting to offer patients acceptable living conditions. However, the dilapidated state of the building combined with the lack of any hospital hygiene requirements (protocols on preventing and combating infections as well as cleanliness and personal hygiene) meant that it was not possible to provide the necessary positive therapeutic environment. Further, the CPT considers that patient dormitories should not accommodate more than four patients and that the cells of 8.5m2 should only accommodate one patient. The excess beds should be removed. The CPT recommends that the Greek authorities pursue their efforts to provide patients at Korydallos Psychiatric Hospital for prisoners with material conditions which are conducive to the treatment and welfare of patients, including as regards hospital hygiene and the provision of rooms and equipment to provide a range of activities. As part of these efforts, the patient occupancy in dormitories should be reduced to a maximum of four and the cells should not accommodate more than one patient. Sanitary annexes should be fully partitioned (including the installation of a door to the toilet in the dormitories). 23. It is also important that attention be given to the decoration of both patients' rooms and recreation areas, to provide patients with visual stimulation. The provision of bedside tables and wardrobes is highly desirable, and patients should be allowed to keep certain personal belongings (photographs, books, etc.). Patients should also be provided with lockable space in which they can keep their belongings; the failure to provide such a facility can impinge upon a patient's sense of security and autonomy. In addition, it is neither safe nor appropriate for patients to have to sleep on the upper level of a bunk bed and the top tier of the bunk beds should be removed. The CPT recommends that steps be taken to improve the furnishings and personalisation of the dormitories and cells, including the installation of lockable storage space, in light of the above remarks. 24. The delegation also met a number of older patients who had reduced mobility and who spent long periods of the day in their beds. As a minimum, these patients should be offered proper hospital beds which allow them more support, such as when they want to sit up in bed and eat. The hospital should also have access to ripple mattresses to help prevent bed sores. The CPT would like to be informed about the specific measures being taken to provide older patients and patients with physical disabilities the necessary care and support they require. It would also like to be informed about the measures in place to ensure that patients with special needs or physical disabilities are afforded the necessary support and are able to access the sanitary facilities and outdoor exercise yard with dignity 25. The prison regime in force meant that patients were unlocked during the day between 08:00 and 13:00 and from 15:00 to 20:30. During unlock, patients were free to roam about the corridors, go outside to the yard or sit in the large dining hall on the first floor, which had no furnishings apart from a television and low fixed benches along the walls and in the centre. Most of the work placements, such as painters, plumbers, builders and assistant nurses were allocated to prisoners transferred from other prisons specifically to work in the hospital. Nevertheless, some 18 patients had an official job working in the kitchen or laundry and 37 of them were designated as cleaners. 9