Let me answer your question with a question. If you were looking for a home, whether it was a vintage home or not, would you be willing to pay more if it were renovated and in good shape? I bet that you would.
The most important factor in renovating older homes is to respect the integrity of the character of the house. Don't tear out stuff and replace it just because it would be easier, cheaper or faster to do it that way. The character of the house will be a far greater selling point than anything else that you do. I'm not saying don't update the kitchen, the wiring or the plumbing, etc. but don't throw out the woodwork, the floors, or anything that says "Hey, I've been here a while and you should be nice to me."
Another thing to remember is that out of every 100 people that look at a vintage home, there will only be about 5 that will have the vision to see what the home could be. I recently sold a house that was about 150 years old. It took a long time to sell because the kitchen was a 1960's kitchen. So many people could not see past that kitchen to appreciate the original hardwood floors, original woodwork, original stairs, etc.
Another thing to keep in mind is there is still a mindset out there among buyers that they should be able to buy a house with everything in and done for half price. They think that everyone is desperate.
Hope this helps.