Not mad at all, I actually know the house you posted, even though it is not the one you are thinking of buying!
All houses need maintaining, older ones you just have to make sure you use the right materials and treat them with a bit of tlc.
Old houses need to breath, so that means using breathable materials, such as lime plaster, certain types of paint and not doing things such as injecting damp proof courses, irrespective of people telling you it should be done.
You spend your money on the important things, the roof is sound, window windows are properly maintained and renovated, guttering doesn't leak.
It is easier to heat stone, older houses for longer at lower temp than to just switch the heating on for an hour and expect it to be warm quickly. Let them get too cold and it will take an age to heat it. We use our CH as background warmth and have the AGA (you can do the same with the Rayburn), woodburners and open fires in the rooms we spend most of the time in as the heat sources to provide the "comfortable" warmth.
Things like interlined curtains and blinds, and original shutters are great for warmth.
The plus point of old stone houses, is they are wonderfully cool in hot weather.
You mentioned being a custodian, this is exactly how you need to think, you are just passing through living in a house which has loads of history, embrace its quirks.