Expansion of cities and their impact areas extend also the semantic boundaries of urban ecentres, while public open space in the city centres maintain attractivity, especially within the medieval cores. The diverse functional processes that satisfy the needs of all users of urban space in general, on the one hand carry the function of circulation or communication, and on the other – relaxation or recreation. Elements of spatial organization and environment planning essential for the realization of each function differ, and depending on which of the functional processes prevails in the particular place, open space acquires either priority of communication or of recreation. The paper focuses on the interests and needs of main groups of users of the historical city centre – Riga Old Town, states availability of adequate space, as well as sets the criteria of high-quality public open space.