mine is a money pit.
we had a full survey done, but there's so much they can't pick up - they can't really access the water, electrics, under floor, on the roof. in some rooms the wallpaper was the only thing holding the plaster on the walls, and there was absolutely no sign of this at the time.
we have a 120yr old lead water supply in the back garden which has started leaking. bathroom plumbing was amateur and shite. It's quite likely in an old house that your plumbing, gas and leccy will be a bit "unique", as it was all added to the house as an afterthought.
agree that odd-shaped rooms means more expense when decorating and furnishing as you need bespoke blinds, shelves etc, and wonky door frames make furniture look odd. window and door frames need repainting regularly to keep the wood in good nick, and due to the height involved that's a job for the professionals.
parking doesn't bother me - sometimes I need to park round the corner, but I lived without a car for years, so a one minute walk to the house seems better than a 10 minute trek from the tram.
heating bliss are ok though - loft is properly insulated, and the walls are very solid, so retain heat well.
I do love my house, but it's like a bad boyfriend - looks great, but requires all my attention and steals my money every month.