There are many elements of a good status page. First and foremost, the key thing is you provide relevant and detailed information regarding the status of your services. A good status page breaks down all the relevant components of your services and displays both their current status and status history. That way, you have transparency between you and your users.
Secondly, a good status page is organized, easy to read, and easy to navigate. If not, it can make it inconvenient for users to try and find out what their issue is. It helps if the page is eye-catching without being overbearing, possibly by including banners or images which are spatially effective and not too large.