For simple usage, GNOME Boxes is really nice. It'll automatically download the ISOs of basically any Linux distro when you click on their logo, automatically go through the installer, and install copy/paste, dynamic resizing of the VM screen when you resize the window (I don't believe virt-manager supports that), and drag/drop support. It uses libvirt behind the scenes, so you can use virt-manager with VMs created by Boxes and vice versa.
I don't think I ever tried drag and drop, but I've gotten copy/paste and window->display resizing to work in virt-manager after manually setting up the kvm/qemu guest tools.
