I happen to have 5 types of appartments I describe on the website. When I look at the Appartments (Rooms)page it only shows four of them and to see the fifth I need need to click the "previous" button. How to expand the list in this view to five appartments?
I think your answer was cut out.
Let's try again:
You should go to Appearance -> Customize -> Posts Settings and change the Room Post per page value to -1. Using that value you will display all posts on the same page so you don't have to care of the button text anymore.