There are no ads in Weebly apart from a banner at the foot of the page advertising their presence - which gets lost if the page is deep enough.

There is a drag and drop "build" system which allows you to populate your web page space with text blocks, image blocks, gallery blocks, etc. You can see the html for each page if you want to, but I never bother with it as it's quite complex.

So I use the site builder software, which is the simplest by far of all the systems I've seen. Even a free site has unlimited pages and unlimited photo uploads - like mine. You can also set the SEO parameters for each page, though I don't whether you can disable access by bots, etc.