The LG WT5170HW does have a sanitary cycle. It's listed under Wash Programs on page 2 of the spec sheet. Here is a link that might be useful: LG WT5170HW Washer Spec Sheet

Basically, LG is just slowing the top spin speed of some if not all cycles (someone correct me if I'm wrong). Do NOT wash anything that is water proof i.e. a bed pad that prevents liquids from seeping through or plastic shower curtains or anything of a similar material. You can basically do this yourself by using a slower spin speed with bulky items. In doing so you can extend the spin to wring out more water (slower spin with extended spin instead of full speed spin and regular spin time). It's up to you what you should do but the consensus seems that the "update" ruins or worsens the cycle program.

You need a home that sits at 45% humidity. That will be (almost) 7 times more then the outdoor humidity. You will have A/C but it won't be enough to keep the humidity up that high. When adding wood over radiant heat (please confirm this is HYDRONIC = water tubes inside concrete/plywood) you DRY OUT the wood FASTER than traditional heating/cooling. And remember: you can only +/- heat from the floor at 5 C intervals over 24 hours. That means if you have a cold snap, it could take 3-4 days to get your house 'warm'...and by then the cold snap could be over. Your humidifier will be hard pressed to keep wood happy and healthy and stable when installed over radiant heat. As in you need a top of the line whole home humidifier that is built to handle a larger square footage than your house. Get the MOST EXPENSIVE unit you can afford. If you don't keep that humidity up, you will find your wood cracking and splitting (we call it checking) and the finish crackling and hazing inside of a year...or two. The splinters created by a dry wood floor = remove and replace.

I think because your house is so old, having 2 differetn wood floors is not an issue especially since the one floor is original. It takes on a different meaning than a house built today with different wood floors mixed throughout. It has a certain charm. It also looks like the shared spot is just a doorway and not an open floor plan. I think you could do a different species of wood floor. I would do a larger plank and make sure the color compliments instead of trying to match. Of course if you can find a pine that is the same as yours ( which to me looks like a heart wood pine ) then go ahead with it , although staining may be tricky Good luck!