This paper explores the ecumenical relationship between two congregations in Berlin: the St. Paul's congregation, founded in 1905 and part of the Evangelische Kirche Deutschland, and the St. Georgis Eritrean orthodox congregation, founded by Eritrean refugees during the so-called "refugee-crisis" in 2015. Since 2018, the two congregations have conducted their activities in the same church, owned by the former. Both offer a range of social support activities to community members. By using an interdisciplinary approach based on a relational understanding of space (Massey 1994), this paper seeks to highlight how academic discussions around religious place-making and place-sharing (Knott 2005; Wyller 2016; Zarnow 2018), as well as on hospitality (Derrida 2000; Rosello 2001;Nahnfeldt & Rønsdal 2021; Picozza 2021), can inform reflections on "unconventional" ecumenism. In this case, the initiative can be described as "encounter as lived ecumenism" (Rammelt and Hornung 2018), to reflect its informal and grassroots nature. In particular, this study highlights the negotiations, including tensions and resource mobilisations, taking place in and through the sharing of a religious space. In doing so, it focuses on the importance of recognising the agency of both congregations. In this sense, this paper is in line with the argument that only an awareness of these nuanced dynamics between "host" and "migrant" congregations can lead to meaningful engagements with the idea of "being church together" (Hoffmann 2019). This paper draws on semi-structured interviews and participant observation conducted with members of the two congregations (including lay leaders, youth and women) between 2023 and 2025, as part of my PhD at Humboldt-University in Berlin. The PhD project is part of the German-South African International Research Training Group "Transformative Religion: Religion as Situated Knowledge in Processes of Social Transformation".