I would like to add more pictures but that is only making the page very long, Is there a way of adding a slide show using a shortcode maybe? For instance We have about 50 studio apartments and the furnishing is different in all rooms. We feel that we should have a lot more pictures
By default, there is no possibility to switch the grid gallery into a slideshow on the page of the accommodation type. You may try not to use the default gallery option but add a slider block to the content area of the accommodation type and add pictures to the Slider block.