Demo the brass and spruce up that home with modern knobs!
I have now personally used these knobs to replace old worn out, and brass knobs in different homes, including my office. They are new knobs that I recommend - they are locking, however there are enough in the pack that will re-do most average sized homes, and at a great price! The egg knob style is transitional, and works in most settings. Door knobs are just one of those things that you don't really notice, that make a big impression in terms of modernizing your home. The egg style is timeless! They also come in different sized sets, so if you need a 12 set or 20 set you can easily order very economically.
What about the hinges I hear you say! You can use metal spray to coat them - just leave the door ajar while they dry, or replace the old brass for new stainless. I've painted quite successfully!