Rental prices in Mülheim an der Ruhr tend to fluctuate based on various factors, including local economic conditions, demand for housing, and seasonal trends. For instance, the prices can peak during the summer months when students are looking for accommodations, often leading to a noticeable rise in rents for apartments near universities and public transport links. Additionally, significant developments or renovations in the area can also drive up rental costs; recent urban renewal projects have resulted in increased demand in formerly underdeveloped neighborhoods. On average, rents in Mülheim have seen a gradual increase of around 2-4% annually over recent years, although certain neighborhoods may experience sharper spikes due to their popularity or proximity to key amenities and services.