Knob and tube wiring started to disappear in the 1940s although I doubt there is a hard date. It is still legal through grandfathering. Similarly, residential coal started to disappear in the 1950s but, again, no hard date. My folks bought a house in North York in 1956 that had been built in 1951. It had a coal convection furnace that dad had converted to forced-air oil (no gas) right after moving in. In had a septic until sewers came down the road in the 60s.
What amenities a 'turn of the century' house likely depends on services available. Urban houses likely had indoor plumbing, but no guarantee, and probably some manner of low-amperage electrical service. Really, what did they need for a few bulbs and maybe a toaster. Whether rural houses had any of that depends on what was running down the road; you can't have a flush toilet w/o pressurized water and you can't have that w/o a pump. Our previous place was an 1890s-built farm house. Interestingly, there is no evidence of K&T wiring - just the original cloth/tar romex, so it seems they went without until at least the 1940s.