This tutorial showed you how to setup a Jomres installation to take bookings for a property like a villa or cottage or apartment.
I used Twenty Twenty Two theme here to show you how you can use vanilla settings in WordPress and Jomres to achieve your goal. I can't show you how to edit the theme itself, that's well outside the scope of this article but there are gazillions of articles on the web that you can read that will help you with that.
Setting up a hotel/pension/guest house/b&b, where you rent out rooms in the property instead of renting out the entire property is approximately the same. Whereas here you set up the property to be "2 Bedroom", in a hotel you would create individual rooms, and the booking form behaves a little differently, but in general it looks more or less the same.
If you decide you want to add more properties to your site later on, you can. In Site Configuration > Portal Functionality tab set "Is this a single property installation?" to No and hey presto, you can add more properties, still for free.