So, an update on how Mucho is doing at 14 weeks old:
We are accident-free in our house for a few days now, and in other places too. We don't even watch him much when he is playing any more, when he wants to pee/poop he will go and stand next to the balcony door and look back at us. Generally when we put down a pee pad for him and show him where it is, he will want to go there to do his business. When visiting we do watch over him more as it's easier for him to get distracted.
He did pee on me (gross!) once where I had him on my lap while in a bar. I guess that he really couldn't hold it anymore, since when we got home he run to his pee pad and went for a really long time. That was my fault entirely for bringing him to his limits.
He has really got used to our schedules, we goes to his crate when we do the "go-to-bed" motions (turn off the lights, etc). He might get up early (6 or 7) but he will quietly chew his toys until we get up. I don't even bother to get up to get him to pee - if I do wake up at night and he's awake, I will get him out for a quick pee and then back to bed.
Sometimes I'll take an afternoon nap on the sofa, and he will curl up on the floor next to me.
playing with us in the morning - it's like he's saying "what took you so long to wake up, I missed you!".
He knows the "wait-for-it" command pretty reliably, he eats 3 times a day (kibble and canned food). He used to leave a bit of kibble on his plate but sometimes he will skip dinner (because we got home too late and he was sleepy) and then he devours everything.
He loves chasing his toys and us (when we play-run). He loves his nylabone (he'll need another soon). He's left the couch alone mostly, but he does chew on things, so we spray vinegar on them and then he avoids them for a day. He does the usual run like hell occasionally, he is very cute. He still bites a bit but not too much.
I'm pretty sure we've hit the 100 person mark. We take him with us almost everywhere that we can, he is very cool. He didn't even flinch when we got him to some friend's band practice, with speakers and drums etc. He loves hearing the bell ring, but hasn't barked yet. He just adores people at the door (friends and delivery men and pretty much everyone). We occasionally arrange some playdates with his breeder so he gets some socialization in. One time whilst we were outside this huge, unleashed male dog approached and sniffed politely. Everything went fine, though I was ready to snatch Mucho out of the jaws should anything happen. He's also met some disabled people and sat on their laps for some quiet petting.
I'm mostly happy with the day-to-day stuff. We have reasonable expectations from him and he's up to them. I'd like to get some proper obedience training in (tricks etc) but I just haven't found proper time to do it. I do train his "behavior" though by rewarding with toys, treats and belly rubs.
We brush almost daily, monitor his nails and get his eye gunk out as often as we see it. He hasn't had a bath yet as he smells terrific and we've been advised to not bathe him until absolutely necessary.
He rides shotgun, in a soft bed at the floor of the car. He curls up and goes to sleep, doesn't complain at all.
We're anxious to get all his shots in so we can go for proper walks, stop carrying him around and start to phase out the pee pad. He's also going to start some puppy classes to start some obedience training and meet more dogs. Until that I don't think there's any other milestones to reach... he's just a great puppy and on the way to become a great dog.