I have a 6 year old....
Yes was difficult to housetrain... only really succeeded at 6 months when we stayed in a caravan for a week and that was so small he learnt he had to go outside.... Yes, still have to watch like a hawk in other people's houses but is fine in ours
Has exceptional bladder control - easy overnight from 10 to 10... as a pup coming back from breeder didnt wee for 4 hours after leaving... we can easily leave him at home for 7 hours without worrying, but clearly don't do that often... typically wees 5-6 times a day not more
Yes cute friendly every one loves him - he gets mobbed in the park and he rather enjoys the attention - loves a tummy rub and just playing with kids
Does hate the rain - have to take him out in his raincoat and then he is fiercely stoical once out.
And re health issues, thoughtfully bred mitigates this - European working dogs far healthier - we got one part Russian for longer legs/shorter back..... and there are a couple of genetic things that need looking out for where you do check the breeder has the right certificates.
But yes, we have got little steps for getting onto sofas and beds which is a bit of a pain and not something i thought about before getting him...
He's not a big barker but we were aware this could be a problem so focussed on this in training from very early on. And he's loved all the other stuff - brilliant recall (very important to us as a London dog who could easily be run over) - good at tricks.