Double-sided printing works well, but scanning is only possible on one side.

Printing yes, it worked for me after I set an appropriate print profile, it didn't work with the standard setting alone. I haven't yet managed to scan double-sided documents directly, but scanning the front and back pages and merging the two documents and putting the pages in the right order is a good and quick workaround for me. The device as a whole is great (quality, scan to mail or cloud (e.g. Drive), ink consumption, etc.).

Yes and yes.
It should be noted that the buttons next to the screen are not backlit, i.e. the printer can only be used in daylight or with proper lighting. Not usable in semi-darkness.