Below is the result of an exhausting amount of cleaning, timed delicately between coats of varnish on the hallway floor, the last wood to be finished. As it turned out, we were unable to sand off the (potentially harmful) glue residue from the nearly 100-year-old wood, and had to lay new wood on top. An unforseen expense, but well worth it.
We started cleaning around 7am Sunday morning (which felt like 6am due to the time change!) and cleaned until 10, when we lay down the last coat of polyurethane and left. By the time Marie's train arrived around 6pm, it was just about dry. Of course I already have some new photos, but here a few from our toils yesterday morning. More soon.
(Note: the red sofa will eventually go in the sunroom once we get a new living room couch. But it does the trick for now.)