Clay tile and wood shakes are more expensive to replace than aluminum or composition shingles. Plumbing repairs can be very expensive. If it's a leaky faucet, no big deal. That's easy and inexpensive to repair. If sinks, tubs or toilets don't drain quickly, that may be a sign that costly repair work is in your future.
Copper pipes are good.
Galvanized steel pipes are not so good. Check the water pressure. Nothing is more irritating than taking a shower when the water barely drips out. Older homes are especially susceptible to this because of aging wires and the multitude of today's electrical appliances. With dishwashers and clothes dryers and air conditioners, we demand much more from electrical systems today than 50 years ago.