Any car can be easy to work on if you become accustomed to it. Meaning that you learn and once you know the best way, most anything is not an issue.
I've helped a friend work on a 2003 93 Aero and I hate that car. Nothing feels straight forward or simple. Space is super cramped, yet if you talk to a guy that knows the car better, he'll have the tips/tricks and I bet it's not so bad.
Few months ago working on an 06 Sentra base model. Brakes all the way around, rear wheel bearings, control arms, tie rods, trans service, oil change and belts. The belts were the toughest part of the job. Oddball angle and threaded tensioner with other bolts that were impossible to see. YouTube ended up being how I learned about the hidden bolts. Overall I had more cuts and scratches than I usually would from a trans swap and rebuild.
Had a Ford Taurus catch fire (I blew it out) while doing an oil change. They put the positive of the starter that close to the end of the oil filter. If you use a metal strap wrench..you can arch it out and cause a problem. Was chatting with a mechanic buddy and mentioned I lit it up during an oil change and he laughed and said that his metal strap wrench had marks in it from the same.
It really all depends on the car. I'd suggest taking a look at youtube vids for various common things on the vehicle you are thinking about and you can get a feeling from that how good/painful they are to work on.