The aim of this qualitative case study is to explore how the teachers, parents and children describe the advantages and disadvantages of preschool education when it is located in the comprehensive school context. In addition, the study aims to clarify which dimensions of the learning environment occur in preschool? The learning environment is defined in physical-aesthetic, psychosocial, and pedagogical-ethical dimensions. Accordingly, the school environment provided a socially rich learning environment for preschool children and allowed versatile relationships between the preschool children and the school's pupils. The physical proximity was beneficial to preschool teachers' co-operation with class teachers and other school experts. However, the physical proximity caused doubts which were related to parents' concerns about children's transportation, their long school days and the organisation of care in the school context. Many preschool teachers experienced that the school context lacked opportunities for play and the amount and quality of indoor and outdoor equipment and material didn't support preschool children's high-quality learning. The school's physical environment had especially significant links with the psycho-social environment by expanding social networks and favorably influencing preschool children's and pupils' school motivation. There were, however, some negative features in the psycho-social learning environment, one of which was bullying, which worried preschool children and was mostly experienced in outdoor activities. (author abstract)