Our home is about 18 years old....we had bleached oak hardwood in the hall, lino in the powder room, and carpet in my office. We had pros come in and add new hardwood to the two rooms and refinish old and new in a darker stain...and the color? well, Jacobean, of course! They did an amazing job, and you can't even see where the new wood begins and the old wood stops.
The result is an updated look for our front hall.
As we were in a mess anyways, I cleaned all the carpets throughout the house as well. It feels good to do the major-clean-thing.....I don't do that as often as I used to, that's for sure!
FYI - I have my own carpet cleaner now but even when I used to rent one....I have always used sudsy ammonia instead of the carpet soap they recommend. It is the best and cheapest cleaner for carpets....I add about 1/2 cup per tank, and use a stronger strength for spots and high traffic areas. The smell is not so terrific as you are doing it but the smell neutralizes once it's dry, it is easy on the carpet fibers, and doesn't leave a soapy residue to attract dirt like carpet shampoos.