I don't like neighbors that stay too long. Most don't though. That little coincidence, Sunni, might just be the thing that makes him snatch you out of the way of an oncoming car, in 20 years, when you don't know who the fuck he is, any more...
Now, were they creepy, with their extended stay, or just curious and "ooooh, look at the new neighbor! Lets make friends, cuz we're bored to death with our lives!" That makes a HUGE difference in the situation. Also, take it from me -- you most definitely need to make your company give you a day off. It's a bit of a "life emergency" and the government doesn't look kindly on companies not respecting that.