Full edition for scientific use. The dataset consists of data from a public participation GIS survey and provides insights into heat perception in the dense and socially heterogenous 15th district in Vienna (Rudolfsheim-Fünfhaus). The data was collected within the research project “BLUEMAP: Map-based citizen knowledge on the use and development of Viennese blue spaces” at the Austrian Academy of Sciences (ÖAW) Institute for Urban and Regional Research. The project was funded by the Anniversary Fund of the City of Vienna for the ÖAW. The project duration was 01.03.2024 - 28.02.2025. Further information about the project can be found here: https://www.oeaw.ac.at/en/isr/sustainable-urban-region/bluemap-map-based-citizen-knowledge-on-the-use-and-development-of-viennese-blue-spaces. The method of data collection was a PPGIS (public participatory geographical information system) survey using the Maptionnaire software (Mapita). The online survey was developed in collaboration with local stakeholders (Gebietsbetreuung Stadterneuerung südwest, Bezirksvorstehung des 15. Wiener Gemeindebezirkes, Wiener Klimateam) with the aim of collecting place-based data about heat and cooling in the 15th district of the city of Vienna (Austria). The survey was open during summer 2024. It was available in five languages: German, English, Serbian/Bosnian/Croatian, Turkish and Hungarian. The sampling procedure was convenience sampling. The survey was distributed through the channels of the cooperation partners (mainly of Gebietsbetreuung Stadterneuerung südwest) and other local organizations, that are active in the 15th district. Additionally, some posters and flyers were distributed in public institutions, local suppliers and recreational facilities. The data consist of socio-demographic data about the respondents, data about perceived heat stress during summers, and mapped locations of 1st public places that are perceived as especially hot during summers, 2nd public places with perceived cooling benefits in summer, 3rd public places where respondents would wish for interventions concerning cooling or heat mitigation. No personal data was collected. The raw data was manually cleaned. Five mapped points for the third mapping question were removed as duplicates, some cases were assigned missing values because of small case counts. 219 respondents engaged with the survey questions, 162 finished the survey. The data includes 2060 mapped locations. The CRS of the spatial data is EPSG:4326 - WGS 84.