Google Vacation Rentals and TripAdvisor are search and metasearch channels: they show your property, rates and availability to travelers who have not decided where to book. Optimizing them means accurate listing content and photos, rate parity and availability across channels, and a direct booking link that is competitive with the OTAs.
Heidelberg sells mostly through Airbnb, Booking.com and Vrbo. Short-term rental pricing in Heidelberg rewards precision on a handful of nights. We load the three illumination Saturdays and the Herbst festival a year out with minimum stays, because guests book those dates months early and undercharged inventory disappears. Outside those dates, Altstadt flats price on weekends and Neuenheim units price on length of stay, with weekly offers for visiting researchers. Gap nights between Christmas market weekends are worth filling with short-notice discounts rather than leaving dark.
Booking.com carries most German and European bookings, Airbnb wins couples and families seeking apartments in the Altstadt, and Vrbo picks up American visitors on longer European itineraries. We keep parity tight, mention castle views and tram stops in every listing, and use mobile and Genius discounts only on soft winter weekdays.
The full service is described on our other ota optimization page; this page covers how it applies in Heidelberg.