Urban life takes place in public open spaces. These are social spaces for gathering and represent a fundamental element of public, social and democratic society. The objective of this masters thesis is to outline the criteria fundamental to high-quality public open spaces. In this thesis a landscaped street area, which emerged in a typical Gründerzeit district at the beginning of the 20th century, is considered. A basis of general criteria, a detailed analysis of the planning area and an investigation of specific data for a particular public open space, Akkonplatz, in Viennas 15th district, resulted in a need for action concerning the precise design. The research questions of this thesis were as follows: what potential exists for the reassessment of public open spaces in Gründerzeit districts? What meaning do these spaces have for the city population? How would an alternative design for the selected area look? These questions will be interrogated using a variety of methods including a literature review, a non-participatory structured observation, a traffic count and a Dérive. There are no legally binding specifications relating to the design of public open spaces; it is governed by road traffic regulations, which stipulate that the use of streets for non-traffic purposes is subject to authorisation. Objectives and directives concerning public open spaces are set out in guidelines such as STEP 05 in which the reassessment of public open spaces is scheduled in the course of gentle urban renewal. The selected questions are relevant in terms of the urban development plan. Jan Gehl argues that to a considerable extent the intensity of use determines the quality of public open spaces. Their design must take the demands of both the users and aesthetic quality into consideration. Appropriate design should facilitate opportunities for safe and comfortable progress on foot, standing, sitting, belonging and for conversation. At Akkonplatz this resulted in a need for action concerning the removal of barriers in the space, the linking of streets and green spaces, the reorganisation of traffic movement, the creation of stimuli for diverse use, the establishment of sight lines and the fostering of short and long visits.