Google going after Airbnb, TripAdvisor with vacation rental listings

France, Paris skyline, Eiffel Tower and cityscape seen from an aerial point of view.

Watch out, Airbnb, TripAdvisor, HomeAway, VRBO and other online vacation-rental companies – there's a new player in your market, and it's very, very big.

Mountain View tech behemoth Google has just started including homes and apartments in results for hotel searches. So far, the destinations are limited to European cities, but the company said it hopes to expand the offerings.