Mine both have health problems (Sammy had knee surgery, Loki has some genetic medical issues) and both were a pain to house train but they are totally trained now. I think people just give up on the housetraining too soon because it takes too long, but trust me it's possible. Loki also had some "yorkshire terror" behavior issues and we did 2 years of training which was awesome and he is the best dog ever now.
Anyway, I wouldn't trade them for anything.
Totally worth it. Sammy greets me every time I come back into a room like she hasn't seen me all day. She makes complete strangers smile with her personality. Her tail never stops wagging. Loki understands complete sentences and MUST sleep touching me (and I have to sleep touching him, so it works
) I love them