I have been looking at houses since last March. I 've look at houses built from the 20s through 80s in Calvert and St. Marys.
I 've seen houses that were renovated end up looking shoddy to me. I.e. CAC was put in an old house (built in 60s) where the duct pipes was put through most closets from basement through the floor (big hole) through the shelves (big hole) through the ceiling (big hole). You get the idea how fugly it looks in every damn room. Not cute and not functional.
Some houses that were built in the 70s comes with either electric baseboard or hotwater baseboard using oil/gas. The idea of hot water leaking all over the floor from broken baseboard got me thinking twice. My mother has seen the kind of damage the hot water can do to the drywalls and hardwood floors. So I stay away from hot water baseboard heating system.
I saw few houses that was built in 20s and 30s but in my mind I knew there's no insulation in the exterior walls as the insulation wasn't invented or wasn't thought of having it done back in the 30s. Some are maintained pretty well and modernized.
I've seen houses that was built in the 80s that may meet the codes but looks terrible and about to fall apart. One house (1984) was asking for $450k which needs lot of work or basically needs to be rebuilt. I mean crappy floor structures, warped panel walls everywhere , shoddy brick job, leaky roof everywhere, house not sitting level anymore and there's too many other things wrong with it. And it comes with a farm tractor and 3 acres.. whoo hoo! but no thanks!
Sorry for rambling ..
Hope you find a house that you like.