The most two important references, that  have described Ottoman houses in Cairo are:
1- “Palais et maisons du Caire.  Tome II: Époque Ottomane (XVIe-XVIIIe siècles)” that mainly described the Cairene  houses which were owned by elite and upper middle class society.
2- “Habiter au Caire: La Maison  Moyenne et ses habitants aux XVIIe et XVIIIe siecles, Cairo, 1991” that mainly  described the traditional houses which were owned by middle class society.
They are registered according to the Egyptian law  on the protection of antiquities no. 117 of 1983. They were built after Fatimid  and Mamluk periods and they occupied the spaces that were empty between the  existing buildings. So, these houses have irregular shape in floor plan level.
They characterized  by verticality (2-3 floors) and dense occupation due to the high cost of land. There  are spaces for receiving guests and other use-s for family living. So, the  design of these houses was requested to separate the circulation between them  to achieve the privacy for the family members \citep{gawad1978islamic}.
Architectural features were used as a tool to achieve privacy too. These architectural features influenced the housing design and achieved different architectural solutions of housing during Ottoman era \citep{hafez2005the}. Several researches discussed the architectural features from social and environmental point of view. In the following table E (part 1&2), there is a conclusion for the main ideas in these researches in addition to schematic plan that shows the distribution of these features, figure (18, 19, 20).