For Brian Chesky, the chief executive of Airbnb, the deaths of five people in a Halloween night shooting at an Airbnb rental in Northern California cut to the heart of the trust on which his business — and many internet companies — is based.

At the DealBook conference last week in New York, he outlined a series of initiatives the company was undertaking to give customers “peace of mind.” They range from checking the accuracy of photographs, addresses and other information posted for each property to verifying that the listings meet safety standards and that the hosts are who they say they are.

In addition to those measures, he said at the conference, the company would conduct especially rigorous reviews of “high risk” reservations that seem likely to lead to parties. It would also establish a hotline to address concerns from neighbors, he said, and guarantee a new Airbnb placement or a full refund to guests who check into a property that does not match the description on the website.

“About two million people a night stay in Airbnbs and most without incident,” Mr. Chesky said. Still, he added, “It’s hard to prevent every bad thing happening.”