The average rental price for an apartment in Heidelberg varies depending on the neighborhood and the size of the apartment. Generally, a one-bedroom apartment in the city center costs between €900 and €1,200 per month, while the same apartment outside the center can range from €700 to €900. Larger apartments, such as three-bedroom units, can command anywhere from €1,500 to €2,500 in central areas. For instance, popular districts like Altstadt or Neuenheim tend to have higher prices due to their proximity to the historic sites and the University of Heidelberg. In contrast, neighborhoods like Pfaffengrund or Kirchheim generally offer more affordable options, with prices that are often 10% to 30% lower than in the city center.