Satisfaction with housing and residential environment is one of the aspects of life satisfaction. The relationship between solitude in personal spaces and collective interaction in the spatial organization of an apartment residential unit is one of the determining factors of the components affecting residents' satisfaction. Providing privacy for family members in the physical space of the residential unit is a foundation and a prerequisite for maintaining privacy and regulating internal relations and communication with the outside of the residential unit. The research question is, what is the relationship between spaces in the types of spatial organization of apartment residential units? What is the effect of the relationship between personal and collective spaces and inter-spaces of the residential unit on the level of satisfaction of the residents? And how can this satisfaction be improved with design solutions? The main goal of the research is to raise awareness for better design of apartment residential units. Other goals of the research can be to better understand the human relationship between the elements of the spatial organization of the residential unit, how to create a platform for individual privacy and collective communication between family members and guests, creating auditory and visual privacy in the interior of the residential unit and overlooking the neighboring units. The above research has benefited from residents to collect data and complete the questionnaire. The case study is limited to the common apartment housing of Amel city (row sets with medium height in three to six floors with spaces such as entrance, connecting stairs, open space and other common structural and facility elements). In these buildings, based on the study of the thesis documents registered in the central municipality of Amel, four types of residential units have been identified, whose spatial organization is the most frequent. The findings of the research show that the residents of apartment residential units have expressed relative dissatisfaction with the lack of necessary provisions in observing the transmission of sight and sound between the internal spaces, observing the necessary distance between the collective and personal spaces, the view from the entrance part of the unit and the openings of the facade to the internal spaces. The result of the research is to propose solutions for entrance design, geometry and plan fit, controlling sound transmission between the spaces of the residential unit, controlling the view from outside the unit and creating a useful space for pause and movement in the spaces between the two main parts of the unit. The research results can be generalized to similar cultures and cities in the north of the country. The table of research design solutions can be adjusted according to the cultural-climatic conditions of other regions of the country in order to develop design guides that are suitable for local cultures and special environments.
