The Windows App doesn't let you organize your pix. You must do that on the Flickr site. But the link codes generated by the App are clean. The codes generated by Flickr carry a lot of extraneous stuff that must be manually edited in a post. A real PITA. But for quick uploads from a camera or HD and sharing, the Win app is seamless.
Flickr has complex organizational tools, and lot of editing capability. Creating Albums, Collections (of photos/albums) is pretty simple, allowing drag-n-drop moving of photos and albums into collections, as well as sorting features.
A free account is 1 Gb storage.The space used is dependent upon the size of the photos uploaded. The system also automatically flags your photos with copyright protection.