I'd say my LO is a 'good' sleeper. After the first week or so, she started sleeping for 3-4 hour stretches at night, so I'd feed her to sleep at 11pm when I went to bed, then she'd wake 2-3 times during the night. She was easy to settle back to sleep as we co-sleep. Once the midwife showed me how to feed her lying down, we were away! If we hadn't been co-sleeping, I don't believe either of us would have slept as well, as I probably wouldn't have woken as quickly when she needed me and we'd both have had to move around to feed her, waking us both up properly and making it harder to resettle her.
She's had phases of waking more or less. By a couple of months old, I think she was feeding at 11pm and then 5am-ish, then waking for the day and milk at 10am (which suited us very nicely as it meant I got time in the morning with my older daughter while she slept, or a lie in if they both slept in!). We could have moved bedtime and wakeup earlier if we'd wanted, I suppose. When teething or feeling ill, she will wake more often, maybe 4 times and growth spurts can mean near-constant feeding, but as we still co-sleep (she is 20 months old now), she can feed while we both sleep. I only wake properly when she can't latch by herself if we've moved too far apart.
We haven't done any sleep training and I've never tried to schedule her naps or anything. Now, her sister has started nursery in the mornings so we have to be up by 7.30am - that's brought bedtimes earlier. At 20 months, she feeds to sleep at around 9pm (I'm slowly moving that earlier as she isn't quite ready to wake when I get her up), has a quick snack at maybe 10.30/11pm when I go to bed, then sleeps until 6am-ish, snacks, then back to sleep till I wake her. She has a good long nap in the afternoons.
Looking back, her sister was pretty much the same in terms of when she wanted milk, but she was FF and we didn't co-sleep so feeding her meant getting out of bed and everybody being a lot more disturbed. So maybe the sleeping is genetic but how you deal with it can make it easy or hard, even if they're 'good sleepers'.