The owner's response time is an important piece of information to take into account when you make a rental request for the same day or the following days.
The response time will give you an idea of how likely it is that your last-minute request will be met.
The shorter the response time, the quicker the owner will respond to your request.
This information is visible under the title of the advert and also at the bottom of the advert in the "About the owner" section.