... in a place where you can leave an unlocked bike in the street for two days without anybody stealing it.

I found this out by leaving my bike unlocked in the street for two days.

I also forgot a doctor's appointment, a couple of days ago - thought it was a day later than it was.

There's no way I'm ever going to be as reliable as other people. There's no way I can make checklists for *everything*, either. I can't possibly make a checklist item out of something like "lock your bike once you get off it."