Accommodation for summer semester 2023 starting from April

Hi, I will be an exchange student in University of Saarland during the summer semester 2023 and urgently searching for accommodation. I am 28 years old and studies Master in Computer Science and AI. Alongside my studies, I am a startup co-founder and spend a lot of time working on it or my study projects.
I am looking for a private room in a flatshare. The most important for me is a reliable internet connection. I am preferably looking for flatmates with a shared interest in startups, would be very interested in having conversations about that. Also, I am not very much a party person anymore so I am not looking for a place where frequent parties are organised. I am a frequent traveler so will spent a lot of time outside appartment.