Ich suche eine möblierte 4 Zimmer Wohnung in Dortmund

We are 2 boys and a girl from Tunisia. We are currently learning german in Perfekt Deutsch Sprachschule online and we will start the C1 face 2 face session in 28 April. We are searching for a 4 rooms flat to rent for 3 months starting from 26 april preferably. We would like the flat to be furnished. It hasn't have to be fully furnished but at least 3 beds, a sofa, a TV and a table and chairs for the kitchen. I hope we find a landlord that fits our requirements and we promise to be nice and take care of the flat. We will make sure that we'll return it as it is without any problems the day we are leaving.
Thank you in advance