Mobile-friendly design basics for a rental website
Open your own site on your own phone, right now, and try to do what a guest would do. Most problems are obvious within thirty seconds.
Check that text is readable without pinching to zoom, that buttons are large enough to tap accurately with a thumb, and that your photo galleries can be swiped rather than requiring a precise click on a tiny arrow. These are the three most common failures on small business sites built primarily by looking at a desktop screen.
Make sure your phone number or contact link actually works as a tap-to-call or tap-to-email link on mobile, not just as plain text a visitor has to copy manually. A guest deciding on their phone, in the moment, is far more likely to follow through on a one-tap action than one that requires switching apps to copy a number first.
Most current website builders produce mobile-friendly pages by default — the more common problem is a custom design, an embedded element (a map, a booking widget, a PDF) that wasn't tested on a small screen, or a table of information that simply doesn't fit and gets cut off. Test every page that contains something other than plain text and photos.
Google treats the mobile version of a page as the primary version it evaluates for most sites — see its own guidance on responsive design — so a page that works well on desktop but badly on mobile is, for search purposes, mostly judged on the broken version.