Another very nice and simple CMS is Webhook. It combines the power and security of a static site generator+hosting with a CMS app.
What I really like about Webflow is that it is non-opinionated. You can start with a blank canvas and create only the content types your site will need. (Nerd content: I also dig that their entire stack is built around grunt generators and a Firebase backend.)
With other CMS’s, you need to try to figure out “what fits where” within your design, as it relates to pre-defined ‘pages’, ‘blocks’, ‘chunks’, etc. – and sometimes that can even influence your design and layout.
But of course, as with most CMS’s, you will need to decouple your site’s primary components (header/footer/content/etc.) and replace them with the appropriate placeholders (partials, variables, etc.) before a CMS is of any use.