The CoordiNet project within Horizon 2020 programme aims to demonstrate how distribution system operators and transmission system operators can act in a coordinated manner to procure and activate grid services in the most cost-effective and reliable way. This is done through the implementation of three large-scale demonstrations in Sweden, Greece and Spain. The first market to be set into operation was within the Swedish demo in the winter of 2019/2020. The outcome of the flexibility market during the first winter with congestion management day-ahead is described in this study. The results from implementation of the platform, user interface, learnings on stakeholder interaction and initial evaluation of key performance indicators are described.