Well, a lot of your larger dogs are going to be the ones that are easiest to house train (bigger bladders) and require less exercise, so my first recs would have been giants. But I'm partial.
Regarding easy house training, I think the biggest thing is to avoid toy breeds of any kind. I've heard bulldogs and poodles (standard and miniature, not toy) are both easy to train, but have no personal experience with it. My experience has been that labs are easy to house train, but they'll have way too much energy for you.
Regarding energy, bulldogs are low energy, but have a bunch of health problems, especially the ones in rescue. Clumber spaniels are supposed to be great for lower energy families, as are Sussex spaniels, but I don't have any personal experience with them. I've heard good things about spitz breeds in this regard as well, and also corgis, but Johanna can probably tell you more about that.

Regarding easy house training, I think the biggest thing is to avoid toy breeds of any kind. I've heard bulldogs and poodles (standard and miniature, not toy) are both easy to train, but have no personal experience with it. My experience has been that labs are easy to house train, but they'll have way too much energy for you.
Regarding energy, bulldogs are low energy, but have a bunch of health problems, especially the ones in rescue. Clumber spaniels are supposed to be great for lower energy families, as are Sussex spaniels, but I don't have any personal experience with them. I've heard good things about spitz breeds in this regard as well, and also corgis, but Johanna can probably tell you more about that.