I wonder if you should look into this a lot further. I find it hard to believe that you can't sell a house in the kind of location you describe, walk away, and find a nice place maybe in one of the more peripheral areas, that will meet your requirements, give you cash in hand, and not touch your $100,000 nest egg. No, you certainly wouldn't end up in the inner city but you could end up in a situation that provides the facilities you need and gives you a financial cushion. That said, my real concern would be how to make this house workable for boarders while preserving your privacy. I think you need to provide a floor plan of what you have for anyone to make anything approaching informed advice.

A good Architectural door hardware supplier would have the goods, some photos following cheers,

It would not be unusual to have black knobs, handles etc and different hinges. It is personal preference though.

I wouldn't be as harsh as Dr Retro , but I'm not a Pro . In fact , I like gold , I like black chrome , I like silver chrome , I like Victorian white tapware , Dr Retro seems to have focused on matt black , but surely thats limiting yourself ? Personally , I'd just go room by room . If your kitchen was dark marble and gloss charcoal cupboard doors etc , then I'd look at gold/brass , or gloss black , or chrome in whatever style complements ( modern in a modern house or modernised house ; 70's in a 70's house ; classic gold or chrome in a Victorian farmhouse ) . If it was ( shiver , shiver ) white benches and cupboard doors and appliances and walls and ceiling , then again black or gold would look great IMO , chrome not so much , but anyone who does white on white on white lacks something anyway haha . So a kitchen , or dining room , or bedroom , or wherever , that is mainly white , or very colourful , or mainly pink , or black and white , may suit some styles , not others . To go one step further , and have black taps and gold handles mixed in one room would depend on the style of the house and/or each room IMO -- gut instinct is no , but I can think of some combo's that may work -- a Victorian house with solid wooden varnished doors , gold/brass handles , a kitchen with a wooden floor , white marble bench-top and black gloss plumbing would look balanced , for example .