This might be long, will try to put all relevant information in so to avoid the dreaded drip feeding...
One or two weeks before Christmas I was in the supermarket as usual on a Wednesday lunchtime straight after school finished with my son. Exited the supermarket to hear an English voice say "oh hi, how are you" in a friendly tone of voice (am expat and while many people here speak English I speak to most of my friends in the local language). I said "oh hello" while thinking "uhmm I don't really think I know you". However he continued saying he knew me from somewhere, had we met before, probably at local pub. I said no I don't drink there.
He told me his Street address then asked why I was shopping in supermarket A when supermarket B was closer to my house (didn't think about this comment until later as tbh I was really just trying to get home to make lunch, I absolutely did not tell him where I lived). He also said he saw me most days last summer and I was always on my own (?! 
)Looked like I was always off to the beach, did I not work?
Boxing day, receive message in my other folder from this guy saying I popped up on his people you may know list. We have no mutual friends, are not in any of the same Facebook groups and I never "check in" anywhere. So was a bit sceptical. Anyway in the message wishes me merry Christmas, asks me out, gives me his address, phone number and email. I didn't accept the message request and did not reply. So although I have read it he won't know as I've not accepted it ifkwim.
So, Wednesday in supermarket A as usual, and he is there. He tries to make chat but, it's lunchtime and I have a hungry son to feed! Don't give it much thought, it's a local supermarket after all, we live in the same district. Thursday I get on my usual tram to take my son to school and he is on it. Not too weird, but the stop for where he told me he lives is about 3 stops before the one I get on. The next and final stop, it doesn't really go anywhere except the tram depot, my sons school and the long road to the next town.
He starts walking with us asking about Christmas, asks my son about his gifts etc. I'm feeling a bit uneasy and rush my son along while, saying something like "oh well have a nice day etc" he then asks me if I have time for a coffee, rather taken aback I blurted out "sorry no I'm on my way to a job interview" and rushed off.
So, finally (if anyone has got this far) is, aibu to think this all really odd. Mainly the supermarket conversation/knowing where I live/movements/tram thing? The balcony thing, as I say, is most likely unconnected but possibly why I'm feeling more freaked out than should be necessary.