Google Ads (former Adwords) since this month has hotel ads integrated as a new campaign type. Still in beta, advertisers can ask to ask via this interest form.
Available in more than 150 countries, on Google.com and Google Maps, Google Hotel Ads helps travelers to browse hotels on mobile devices and spot paid sponsored hotel deals.
Google is also launching a new Hotel Center to simplify the management of the hotel price feeds, similar to Google Merchant Center.
The new Hotel Center will allow price feed management, simplifying feed troubleshooting, optimize the feed’s health with actionable opportunities and one-click fixes, and to power other price feed-based hotel features in the future, like dynamic remarketing creatives.
Google Hotel Ads on Google Ads platform will allow hotel groups to organize hotels by important attributes like brand and class; bidding controls that allow  optimization for bidding dimensions unique to hotels like a traveler’s length of stay or check-in day and audience bidding; Smart bidding powered by machine learning to maximize bookings at your ROI goal; Rich reporting and familiar responsive interface available with the newly redesigned Google Ads.
In the first six months of 2018, the number of leads to partners grew 65 percent year over year, and "hotel ad partners are happy with the volume of leads and booking," said Michael Trauttmansdorff, Senior Product Manager, Hotels, at Google.