The average rent for a one-bedroom apartment in Köln-Rondorf typically ranges from €700 to €900 per month. This price can vary based on factors such as the apartment's size, condition, and proximity to public transportation. Newer or recently renovated units may command higher rents, sometimes exceeding €1,000, especially if they are located closer to major amenities. For example, a modern one-bedroom apartment near the local parks and shops could be listed at around €850, while a more dated unit farther from the main bus routes might rent for about €750. Additionally, costs can differ based on heating and other utility inclusions, which are essential to consider in the overall rental price.